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April 20, 2014

Search: UPSTREAM

Number of results: 396

Precalc
Boat velocity component upstream = 16 cos 35 - 3 = 13.1 - 3 = 10.1 kn Boat velocity component across stream = 16 sin 35 = 9.18 kn resultant speed = sqrt(10.1^2+9.18^2) = 13.6 kn tangent of resultant angle to upstream = 9.18/10.1 = .909 so angle to upstream = tan^-1 .909 = 42.3...
Friday, April 11, 2008 at 12:29pm by Damon

Trig
Aim upstream at angle A = sin^-1(6/37) = 9.3 degrees The upstream component of the boat's velocity relative to the water will then cancel out the river's flow speed.
Sunday, May 2, 2010 at 5:52pm by drwls

math
The upstream speed is 10-5 = 5mph. So, it will take 26/5 hours to go upstream 26 miles.
Wednesday, February 1, 2012 at 1:34am by Steve

UPSTREAM
THIS EXURSION WITH A BOAT TRAVEL 35KM UPSTREAM AND THEN BACK AGAIN IN 4 H 48 MINUTRE. iF THE SPEED OF THE BOAT I5 K,/H, WHAT IS THE SPEED OF THE CURRENT? Let v be the speed of the current. The boat's speed upstream (relative to the land) is 15-v and the speed downstream is 15+...
Thursday, December 21, 2006 at 2:21am by CINDY

motion problem
Ric can row upstream against a current at 6kph in 10 hrs while it will take him only 4 hrs going back. how far does he go upstream? (w/ solution pls... tnx)
Tuesday, November 12, 2013 at 8:35pm by MNHS MNHS

Physics help ASAP please
If the boat is headed upstream, so that it moves directly across the stream, then sinTheta=10/16 where theta is the angle upstream frm the line across. then velocity across= 16cosTheta
Monday, September 26, 2011 at 6:22pm by bobpursley

7th Grade Math
Toni rows a boat 4.5km/h upstream and then turns around and rows 5.5km/h back to her starting point. If her total rowing time is 48 min , for how long does she row upstream?
Wednesday, January 4, 2012 at 3:34pm by Rebecca

Math
Dayle is paddling his canoe upstream, against the current, to a fishing spot 10 miles always. If he paddles upstream for 2.5 hours and his return trip takes 1.25 hours, find the speed of the current, and his still water????????
Tuesday, February 1, 2011 at 7:55pm by Candice Watt

algebra
A boat travel 4 miles upstream with a current of 5 miles per hour. It takes 40 mminutes longer to go upstream. How fast does the boat go downstream
Sunday, June 1, 2008 at 12:50am by Kim

Math
Toni rows a boat 4.5 km/h upstream and then turns around and rows 5.5 km/h back downstream to her starting point. If her total rowing time is 48 min, for how long does she row upstream? you can express your answer to the nearest minute. I don't understand how you solve it.
Saturday, January 17, 2009 at 3:39pm by Angie

MATH!!!!!!!
The river boat paddled upstream at 12km/h, stopped for 2 h of sightseeing, and paddled back at 18km/h. How far upstream did the boat travel if the total time for the trip, including the stop, was 7h? Please help me, the answer is 36 km but i have no idea how to set it up
Tuesday, January 8, 2008 at 8:34pm by bert

math
need help. Young salmon hatch in freshwater steams and then migrate downstream to the ocean at the rate of 70 miles in 8 hours. there they live until they reach spawning age. then they return upstream to fresh water to spawn and usually die soon after. on the upstream trip, ...
Monday, February 7, 2011 at 4:38am by alicia

algebra
a boat goes 16 Km upstream and 24 Km downstream in 6hrs.it can go 12Km upstream and 36 Km in same time.find the speed of boat in still water and speed of the stream
Sunday, September 5, 2010 at 4:49am by sara

algebra
a boat goes 16 Km upstream and 24 Km downstream in 6hrs.it can go 12Km upstream and 36 Km in same time.find the speed of boat in still water and speed of the stream
Sunday, September 5, 2010 at 4:50am by sara

physics
Sheena can row a boat at 2.90 mi/h in still water. She needs to cross a river that is 1.22 mi wide with a current flowing at 1.55 mi/h. Not having her calculator ready, she guesses that to go straight across, she should head 60.0° upstream. (a) What is her speed with respect ...
Thursday, September 13, 2012 at 6:52pm by Christina

physics
Sheena can row a boat at 3.13 mi/h in still water. She needs to cross a river that is 1.10 mi wide with a current flowing at 1.75 mi/h. Not having her calculator ready, she guesses that to go straight across, she should head 60.0° upstream. (a) What is her speed with respect ...
Sunday, September 8, 2013 at 12:04am by Megan

Math
Steve can kayak at 8 km/h in still water. On the river, Steve and the kayak travel slower upstream due to the current. It takes him 1.5 h for a trip downstream, but 3.25 h for the same distance upstream. Determine the speed of the river’s current.
Wednesday, June 19, 2013 at 9:59pm by Maggie

Physics
Salmon often jump upstream through waterfalls to reach their breeding grounds. One salmon came across a waterfall 1.30 m in height, which she jumped in 1.3 s at an angle of 72° to continue upstream. What was the initial speed of her jump? (Assume the launch angle is measured ...
Monday, May 21, 2012 at 5:24pm by James

Physics
b: She has to have a component upstream of 2.0m/s to avoid going down stream. The angle she goes upstream is theta=arcSin(2/3) the velocity across the stream then is 3cosTheta=3cos(arcSin(2/3)) a) if she swims directy across, she does downstream, her velocity is sqrt(2^2+3^2)
Sunday, November 13, 2011 at 1:52pm by bobpursley

PHYSICS
Sheena can row a boat at 2.91 mi/h in still water. She needs to cross a river that is 1.24 mi wide with a current flowing at 1.54 mi/h. Not having her calculator ready, she guesses that to go straight across, she should head 60.0° upstream. (a) What is her speed with respect ...
Tuesday, January 31, 2012 at 7:14pm by Anonymous

algebra
36 Upstream, downstream. Junior’s boat will go 15 miles per hour in still water. If he can go 12 miles downstream in the same amount of time as it takes to go 9 miles upstream, then what is the speed of the current?
Friday, December 4, 2009 at 2:30am by Linda

Physics
A boat must cross a 260-m-wide river and arrive at a point 110 upstream from where it starts. To do so, the pilot must head the boat at a 45 degree upstream angle. THe current has speed 2.3 m/s. a) What is the speed of the boat in still water? b) How much time does the journey...
Tuesday, February 5, 2013 at 1:09am by Chris

Math
A boat, whose speed in still water is 2.80m/s , must cross a 280m wide river and arrive at a point 120m upstream from where it starts. To do so, the pilot must head the boat at a 45.0 degrees upstream angle. What is the speed of the river's current?
Saturday, September 12, 2009 at 1:12pm by Anne

algebra
Show a complete solution. Upstream, downstream. Junior’s boat will go 15 miles per hour in still water. If he can go 12 miles downstream in the same amount of time as it takes to go 9 miles upstream, then what is the speed of the current?
Friday, July 17, 2009 at 1:40am by Sandra

PHYSICS
Sheena can row a boat at 2.91 mi/h in still water. She needs to cross a river that is 1.24 mi wide with a current flowing at 1.54 mi/h. Not having her calculator ready, she guesses that to go straight across, she should head 60.0° upstream. (a) What is her speed with respect ...
Monday, January 30, 2012 at 1:08am by Anonymous

algebra
They probably expect you to assume that the boat is using the same power to go through the water in both directions. Let V be the boat speed relative to the water in both directions. Relative to the shore, its speed is V+5 going downstream and V-5 going upstream. Let T be the ...
Sunday, June 1, 2008 at 12:50am by drwls

math
A boat travels 8km upstream and back in 2 hours. If the current flows at a constant speed of 3km/h, Find the speed of the boat in still water.(when the boat goes upstream, it speed reduces by 3km/h, and when going downstream, its speed increases by 3 km/h)
Tuesday, January 15, 2013 at 5:48am by zshen

Maths
A river flows at 3km/h. At what speed must a boat travel in order to make a 35km trip upstream in a time of 50 minutes? How long will it take the boat to make the return trip downstream? (Assume the boat retains the speed travelled upstream) Working out please
Thursday, October 6, 2011 at 7:52pm by Babiinoob

Maths
Where was Tom when Michael started rowing? He must have been farther upstream at the time. I will assume Tom was one km upstream when Michael started rowing. Let v = the river speed and V = 10v be Michael's speed in still water. Michael rows downstream at a land speed v + V = ...
Tuesday, August 19, 2008 at 4:34am by drwls

Physics
You are riding on a jet ski directed at an angle upstream on a river flowing with a speed of 2.8 m/s. If your velocity relative to the ground is 8.2 m/s at an angle of 25.0° upstream, what is the speed of the jet ski relative to the water?
Sunday, August 28, 2011 at 9:22pm by Nikki

college-Physics
Two canoeists in identical canoes exert the same effort paddling and hence maintain the same speed relative to the water. One paddles directly upstream (and moves upstream), whereas the other paddles directly downstream. With downstream as the positive direction, an observer ...
Wednesday, September 24, 2008 at 6:10pm by Tristan

Physics
Two canoeists in identical canoes exert the same effort paddling and hence maintain the same speed relative to the water. One paddles directly upstream (and moves upstream), whereas the other paddles directly downstream. With downstream as the positive direction, an observer ...
Wednesday, September 24, 2008 at 6:08pm by Tristan

physics
Two canoeists in identical canoes exert the same effort paddling and hence maintain the same speed relative to the water. One paddles directly upstream (and moves upstream), whereas the other paddles directly downstream. With downstream as the positive direction, an observer ...
Wednesday, September 24, 2008 at 6:56pm by Tristan

Physics
You are riding on a Jet Ski at an angle of 35¢ª upstream on a river flowing with a speed of 2.8 m/s. If your velocity relative to the ground is 9.5 m/s at an angle of 20.0¢ª upstream, what is the speed of the Jet Ski relative to the water? (Note: angles are measured relative ...
Thursday, March 13, 2008 at 4:18pm by Clarita

math
speed of boat ---- x mph speed downstream = x+4 speed upstream = x-4 time upstream = 24/(x-4) time downstream = 40/(x+4) 40/(x+4)= 24/(x-4) cross-multiply 40x - 160 = 24x + 96 16x = 256 x = 16
Monday, July 23, 2012 at 11:15pm by Reiny

MaTh
Let V be the speed in still water, in mph. The speed with respect to land will be V-4 upstream and V+4 downstream. Upstream travel time (in hours) = Downstream travel time + 1/3 hour. 5/(V-5) - 5/(V+5) = 1/3 Solve for V [5(V+5) - 5(V-5)]/(V^2 -25) = 1/3 50/(V^2-25) = 1/3 150...
Saturday, September 22, 2007 at 9:54am by drwls

math help please
Downstream velocity is vb+vs Upstream velocity is Vb-Vs You are given Vb. upstream: 300=(vb-vs)T downstream:360=(vb+Vs)T add the equations... 660=2vbT solve for time. Then, go back to either equation and solve for vstream.
Friday, March 20, 2009 at 5:54pm by bobpursley

Algebra 2
A boat has a 10 gallon gasoline tank and travels at 20mi/hr with a fuel consumption of 16mi/gal when operated at full throttle in still water. The boat is moving upstream into a 5mi/hr current. How far upstream can the boat travel and return on 10 gallons of gasolineif it is ...
Thursday, November 3, 2011 at 10:52am by GY

Math
let Toni's time rowing upstream be t hours, then his time rowing downstream is .8-t hours (48 min = .8 hours) distance upstream = 4.5t distance downstream = 5.5(.8-t) but the distance is the same either way, so... 4.5t = 5.5(.8-t) solve for t your t will be in hours, so ...
Saturday, January 17, 2009 at 3:39pm by Reiny

physics
You want to swim straight across a river that is 76m wide. You find that you can do this if you swim 28 degrees upstream at a constant rate of 1.7m/s relative to water. At what rate does the river flow? The angle is measure from the river bank (directly upstream is 0 degrees ...
Sunday, March 7, 2010 at 10:23pm by Amber

7th Grade Math
Distance= rate*time Distance upstream = distance downstream Time should be converted to hour b/c the units for rate is in /hour. We know the total time so assign one of the times x (upstream time b/c you would only have to solve for x to get its time) and the other the total ...
Wednesday, January 4, 2012 at 3:34pm by TutorCat

algebra
t going upstream (5 - t) going downstream speed upstream = (v-3) speed downstream = (v+3) 36 = t(v-3) 36 = (5-t)(v+3) 36 = t v - 3 t t = 36/(v-3) 36 = [5 - 36/(v-3)] (v+3) 36 = 5(v+3) - 36(v+3)/(v-3) (21 - 5 v)(v-3) = -36(v+3) check, multiply out and solve quadratic for v
Monday, April 4, 2011 at 1:00pm by Damon

Physics
You are riding on a jet ski directed at an angle upstream on a river flowing with a speed of 2.8 m/s. If your velocity relative to the ground is 8.9 m/s at an angle of 26.0° upstream, what is the speed of the jet ski relative to the water? (Note: Angles are measured relative ...
Sunday, October 14, 2012 at 2:17pm by HELP PLEASE

physics
draw the velocity diagram. I assume the figure has him swimming slightly upstream and the current is keeping him in a straight across path. His velocity upstream/relative water+ velocity of water=his resultant velocity But these are vectors, and it is a right trianagle. .64^2=...
Tuesday, February 4, 2014 at 9:15pm by bobpursley

Algebra II
I've been working on this one and I just can't figure it out. I appreciate all the help: Two miles upstream from his starting point, a canoeist passed a log floating in the river's current. After paddling upstream for one more hour, he paddled back and reached his starting ...
Wednesday, October 29, 2008 at 6:09pm by Aaron

Physics continuation - Damon please help
The river flowed at 10 km/hr the boat went at 24 km/hr The boat must head upstream such that 24 sin T = 10 or T = 24.6 degrees upstream of straight across By the way, his speed across the river is now 24 cos 24.6 degrees = 21.8 km/hr
Tuesday, February 26, 2008 at 7:35pm by Damon

Algebra
Tom can row at the rate of 12 kilometers per hour in still water. He rows upstream for two hours and returns in one hour and twelve minutes. Find the rate of the current. D=r*t R=12 km per hour T= two hours --------------------------- speed upstream = 12 - c speed downstream...
Wednesday, March 5, 2014 at 3:28pm by Damon

Economics
A large firm has two divisions: an upstream division that is a monopoly supplier of an input whose only market is the downstream division that produces the final output. To produce one unit the final output, the downstream division requires one unit of the input. If the ...
Wednesday, June 15, 2011 at 6:58pm by Kathy

math
Let the speed of the boat in still water be x km/h time upstream = 8/(x-3) time downstream = 8/(x+3) 8/(x-3) + 8/(x+3) = 2 times (x+3)(x-3) 8(x+3) + 8(x-3) = 2(x+3)(x-3) 8x + 24 + 8x - 24 = 2x^2 - 18 2x^2 -16x - 18 = 0 x^2 - 8x - 9 = 0 (x-9)(x+1) = 0 x = 9 or x = -1, a ...
Tuesday, January 15, 2013 at 5:48am by Reiny

physics
A fisherman sets out upstream from Metaline Falls on the Pend Oreille River in northwestern Washington State. His small boat, powered by an outboard motor, travels at a constant speed v in still water. The water flows at a lower constant speed vw. He has traveled upstream for ...
Wednesday, February 16, 2011 at 12:36pm by Anonymous

physics
A fisherman sets out upstream from Metaline Falls on the Pend Oreille River in northwestern Washington State. His small boat, powered by an outboard motor, travels at a constant speed v in still water. The water flows at a lower constant speed vw. He has traveled upstream for ...
Friday, February 18, 2011 at 12:33pm by Anonymous

Algebra. Please help(:
The time required for a trip 108 miles downstream on a steamer is 3 hours less than the time required for the upstream trip. A boat whose rate is 6 miles per hour less than that of the steamer required 9 hours more for the upstream trip than for the downstream trip. Find the ...
Sunday, April 22, 2012 at 6:15pm by My Name Is Bob

Algebra
The time required for a trip 108 miles downstream on a steamer is 3 hours less than the time required for the upstream trip. A boat whose rate is 6 miles per hour less than that of the steamer required 9 hours more for the upstream trip than for the downstream trip. Find the ...
Friday, April 11, 2014 at 11:02pm by Summer

UPSTREAM
900
Thursday, December 21, 2006 at 2:21am by Anonymous

Physics
A boat moves through the water of a river at 5 m/s relative to the water, regardless of the boat's direction. If the water in the river is flowing at 1.3 m/s, how long does it take the boat to make a round trip consisting of a 215 m displacement downstream followed by a 215 m ...
Sunday, June 1, 2008 at 2:38pm by Elisa

Physics
A boat moves through the water of a river at 5 m/s relative to the water, regardless of the boat's direction. If the water in the river is flowing at 1.3 m/s, how long does it take the boat to make a round trip consisting of a 215 m displacement downstream followed by a 215 m ...
Sunday, June 1, 2008 at 2:41pm by Elisa

algebra
could you please show me how to do this problem? Bob rows 6 miles downstream in 1 hr, joe rows 6 miles upstream in 2 hr. joe rows 1 mile per hour faster. a. what is each of their speed, bob 6/1=6mph joe 6 + 1 = 7mph is this right?? b. what is the current speed?? downstream R...
Sunday, April 15, 2012 at 3:14am by ann

Physics
Two canoeists in identical canoes exert the same effort paddling and hence maintain the same speed relative to the water. One paddles directly upstream (and moves upstream), whereas the other paddles directly downstream. With downstream as the positive direction, an observer ...
Sunday, February 19, 2012 at 11:47pm by Anonymous

word problem
A motor boat took 4 hours to make a downstream trip with a current of 3mph. The return trip against the same current took 8 hours. Find the speed of the boat in still water. Call Y the boat's rate. distance = rate x time. downstream rate of boat is Y+3. t=4 hrs. upstream rate ...
Thursday, June 22, 2006 at 9:11pm by marie

Math: Calculus - Vectors
How can the textbook answer be 15.3 m/s if they are asking for the crossing time? To go directly across, the boat must aim upstream so that the velocity component upstream relative to the water is 2 m/s. That makes its velocity component across the water sqrt[5^2 - 2^2) = sqrt...
Tuesday, February 19, 2008 at 10:29pm by drwls

physics
Upstream? the difference in velocities, downstream the sum. Does that make sense? vbg=vbs+vsg where vbg is velocity of boat relative to ground; vbs is veloicty of boat relative to stream, and vsg is velocity of stream relative to ground. But note, in the case of upstream, the ...
Wednesday, October 8, 2008 at 10:54am by bobpursley

physics
say the boat travels at angle T from straight across. Then the upstream component of the boat velocity relative to water must be .5 m/s to counteract current so 6.75 sin T = .5 m/s sin T = .5/6.75 = .0741 so T = sin^-1 (.0741) = 4.25 degrees from straight across toward ...
Tuesday, January 1, 2008 at 8:12pm by Damon

Algebra 2
It is a beautiful spring day so you decide to go rowing upstream on your favorite river. You row at a constant rate of 1 mile per hour. Suddenly a gust of wind blows your hat off into the water. You watch it float away downstream but since you never really liked it that much, ...
Monday, February 8, 2010 at 11:50pm by John

math
let spped of current be X, when the boat goes upstream, the actual speed of boat= speed of boat-speed of current;when the boat goes downstream, the speed =speed of boat+speed of current distance=speed x time upstream: (16-X)x 1/3 downstream:(16+X)x1/4 since the total distance ...
Wednesday, September 3, 2008 at 9:34pm by ZZ

Algebra 2
how would you solve: the current in the river flowed at 3 mph. The boat could travel 24 mph downstream in half the time it took to travel 12 mi upstream. what was the speed of the boat in still water? please help. The time required to go any distance upstream a distance L is L...
Sunday, June 18, 2006 at 12:28pm by Jonathan

mathematics
The speed in still water is X km/h, so the speed upstream is (X-3) km/h (slower than X because it's upstream), and the speed downstream is (X+3) km/h (faster than X because it's downstream). Travelling at (X-3) km/h for 12 km will take 12/(X-3) hours, and travelling back again...
Wednesday, September 3, 2008 at 1:50pm by David Q

Physic Please help
speed upstream = 1.15 - .276 = .874 m/s time upstream = 1.4 * 10^3/.874 = 1601 seconds speed downstream - 1.15 + .276 = 1.426 time downstream = 1.4*10^3/1.426 = 982 seconds total time = 1601+982 = 2583 seconds 2583/60 = 43 minutes
Saturday, September 8, 2012 at 7:48pm by Damon

physics
Since it is going upstream, subtract the river flow velocity.
Thursday, August 4, 2011 at 10:56am by drwls

math
That depends upon whether the kayak is going upstream or downstream. Which is it?
Friday, December 9, 2011 at 7:16am by drwls

physics
You are riding on a jet ski at an angle upstream on a river flowing with a speed of 2.8 m/s. Suppose the jet ski is moving at a speed of 18 m/s relative to the water. (a) At what angle must you point the jet ski if your velocity relative to the ground is to be perpendicular to...
Monday, May 14, 2007 at 7:55pm by micole

physical
60 - 5 = 55 km/hr. Steaming upstream slows it down.
Sunday, July 29, 2012 at 11:18pm by drwls

Algebra
You have these reversed, faster downstream speed upstream = 13 - v speed downstream = 13 + v time = distance/rate 14/(13+v)= 8/(13-v) 182 - 14 v = 104 + 8v 22 v = 78 v = 3.55 mph check speed downstream = 3.55+13 = 16.54 time downstream = 14/16.54 = .846 hr speed upstream = 13...
Sunday, June 1, 2008 at 10:10am by Damon

Physics continuation - Damon please help
The answer says 65 degrees upstream. I don't know how they got that.
Tuesday, February 26, 2008 at 7:35pm by Anonymous

English
Standing under a waterfall? Firehoses? Swimming upstream on land? I hope this helps.
Wednesday, January 13, 2010 at 9:38pm by PsyDAG

Physics
maybe go with the current to cross faster and upstream to make a shorter distance I'm only in gr.9 but I hope this helps
Monday, October 12, 2009 at 8:41pm by alyce

Critical Reading
floundering in the dark? swimming upstream? attending a brick-and-mortar college? Which of those -- if any -- seem invalid to you?
Sunday, November 14, 2010 at 4:16pm by Ms. Sue

physics111
b. time to go across: distanceEast/VelocityEast a. he is heading upstream: direction=arctan2/4.2 magnitude: speed=sqrt(4.2^2+2^2)
Tuesday, April 2, 2013 at 9:33am by bobpursley

Thermodynamics
In a multiple-device flow system, I want to determine a state property. Where should I look for information, upstream or downstream?
Monday, May 13, 2013 at 7:18pm by Kyle

Physics
respect to the shore? The boat has to head upstream, and that velocity is countered by the stream: v=sqrt(1.95^2-1.2^2) So the slant angle reduces the speed across.
Wednesday, October 17, 2012 at 3:13pm by bobpursley

math
if x=0 means straight across, you need to go upstream at an angle x where sin x = 1.4/2.5 note that the 3-mile width and southward flow of the water are irrelevant
Friday, March 15, 2013 at 12:22am by Steve

physics
Are you trying to go straight across the river by aiming upstream? What is meant by an angle of 23 south? South of what?
Thursday, February 9, 2012 at 7:23am by drwls

word problem
A cruise boat travels 96 miles downstream in 3 hours and returns upstream in 6 hours. Find the rate of the stream.
Thursday, June 22, 2006 at 9:11pm by Anonymous

maths
A motor boat goes downstream twice as fast as upstream. Find the power speed of the boat if the water flows at 6km/h.
Monday, December 24, 2012 at 1:40pm by Anonymous

college math
boat travels 160 miles downstream in the same time that it takes to go 96 upstream. the pead of the stream is 6 mph. what is the speed of still water
Friday, March 9, 2012 at 4:57pm by victor

how do i set up this problem?
A cruise boat travels 48 miles downstream in 3 hours and returns upstream in 6 hours. Find the rate of the stream
Sunday, March 8, 2009 at 9:40pm by Angela G

math
Solve the problem. A cruise boat travels 48 miles downstream in 3 hours and returns upstream in 6 hours. Find the rate of the stream.
Friday, March 20, 2009 at 6:44pm by anthony

math
a kayak travels 15/h in still water and if the current flows at a rate a 3km/h how long will it take for the kayak to travel 30km upstream
Monday, December 17, 2012 at 8:25pm by yvette

physics
A boat, whose speed is 1.75 m/s must aim upstream at an angle of 26.3 degrees ( with respect to a line perpendicular to the shore) in order to travel directly across the stream?
Thursday, September 12, 2013 at 12:23am by Izzy

Math
A river flows at the rate of 2 mph. If a motorboat can travel 12 miles upstream and return in a total of 2.5 hours, what is the speed of the motorboat in still water?
Monday, April 11, 2011 at 3:48pm by Anonymous

Please help
A motorboat can travel upsteam on a river at 18km/h and downsteam at 30km/h. How far upstream can the boat travel if it leaves at 8:00am and must return by noon?
Thursday, January 3, 2013 at 2:49pm by Ashley

Physics - urgent, please help
In its final trip upstream to its spawning territory, a slamon jumps to the top of a waterfall 1.9m high. What is the minimum vertical velocity needed by the salmon at the end of this motion?
Saturday, February 21, 2009 at 10:59pm by Li

physics
a motorboat travels 25.0 km/h in still water. what will be the magnitude and direction of the velocity of the boat if it is directed upstream on a river that flows at the rate of 4.00 km/h?
Thursday, August 4, 2011 at 10:56am by Anonymous

Math
Victoria has a boat that can move at a speed of 20km/h in still water. She rides 140km downstream in the same time it takes 35km upstream. What is the speed of the river?
Thursday, May 17, 2012 at 2:57am by Courtney

math (algerba 1)
A motorboat can travel upstream on a river at 18km/h and downstream at 30km/h. How far upsteam can the boat travel if it leaves at 8am and must return by noon?
Wednesday, January 2, 2013 at 6:26pm by Kate

math (algerba 1)
A motorboat can travel upsteam on a river at 18km/h and downsteam at 30km/h. How far upstream can the boat travel if it leaves at 8:00am and must return by noon?
Thursday, January 3, 2013 at 12:07pm by Ashley

math 116
The downstream speed with respect to land is V+6 and the upstream speed is V-6, where V is the speed in still water. Let the distance be D D/(V+6) = 4 hrs D/(V-6) = 5 4(V+6) = 5(V-6) V = 54 mph
Tuesday, March 3, 2009 at 7:56pm by drwls

algebra
tana rode a boat 1 km upstream in and hour. rowing at the same rate, she made the return trip downstream in 15 minutes. find the rate of the current
Friday, April 29, 2011 at 3:17pm by lee

math
A river has a current of 4 mph. Find the speed of Simon’s boat in still water if it goes 40 miles downstream in the same time as 24 miles upstream.
Monday, July 23, 2012 at 11:15pm by john

Algebra 2
The speed of the current is 5m/h. Angie goes upstream 25 miles and returns to the doc. The whole trip takes 12 hours. What is the speed of the boat in still water?
Wednesday, May 11, 2011 at 1:32pm by Lori

math
A kayak moves at a rate of 12 mph in still water. If the rivers current flows at a rate of 5mph how long does it take the boat to travel 23 miles upstream?
Sunday, September 16, 2012 at 8:41pm by ashley

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