Wednesday

September 3, 2014

September 3, 2014

Number of results: 32,609

**Algebra 2**

saturn is approximately 1.4 x10^9 kilometers from the Sun. If light travels at approximately 3.0 x 10^5 kilometers per second, how long does it take light from the Sun to reach Saturn? Express your answer in scientific notation.
*July 6, 2008 by Mary*

**Algebra II**

The problem states: Saturn is approximately 1.4x 10 to the 9th power kilometers from the Sun. If light travels at approx. 3.0 x 10 to the 5th power kilometers per second, how long does it take light from the Sun to reach Saturn? Express your answer in scientific notation. The ...
*February 3, 2008 by Lucy*

**astronomy**

1. The radius of the Sun is 7 X 10^5 kilometers. Use powers of ten to show that the Sun's radius is about 100 times the Earth's radius. 2. Given that an astronomical unit is 1.5 X 10^8 kilometers and a light-year is about 10^13 kilometers, how many AU are in a light-year? 1 x ...
*April 3, 2007 by John*

**pre-algebra**

A) light travels at approximately 186,000 miles per second. approximately how far will it travel in 1 minute? express your answer in scientific notation B) the sun is approximately 93,000,000 miles from the earth. about how long does it take light to travel from the sun to the...
*November 13, 2008 by Extra homework*

**my pre-algebra questions**

A) light travels at approximately 186,000 miles per second. approximately how far will it travel in 1 minute? express your answer in scientific notation B) the sun is approximately 93,000,000 miles from the earth. about how long does it take light to travel from the sun to the...
*November 13, 2008 by NObody answers*

**8th grade**

A) light travels at approximately 186,000 miles per second. approximately how far will it travel in 1 minute? express your answer in scientific notation B) the sun is approximately 93,000,000 miles from the earth. about how long does it take light to travel from the sun to the...
*November 13, 2008 by 8th grade*

**scientific notation?**

A) light travels at approximately 186,000 miles per second. approximately how far will it travel in 1 minute? express your answer in scientific notation B) the sun is approximately 93,000,000 miles from the earth. about how long does it take light to travel from the sun to the...
*November 13, 2008 by 8th grade*

**math**

Phil is making a 40-kilometer canoe trip. If he travels at 30 kilometers per hour for the first 10 kilometers, and then at 15 kilometers per hour for the rest of the trip, how many minutes more will it take him then if he travels the entire trip at 20 kilometers per hour?
*January 12, 2013 by Larry*

**math**

Phil is making a 40-kilometer canoe trip. If he travels at 30 kilometers per hour for the first 10 kilometers, and then at 15 kilometers per hour for the rest of the trip, how many minutes more will it take him then if he travels the entire trip at 20 kilometers per hour?
*January 12, 2013 by Larry*

**math**

Phil is making a 40-kilometer canoe trip. If he travels at 30 kilometers per hour for the first 10 kilometers, and then at 15 kilometers per hour for the rest of the trip, how many minutes more will it take him then if he travels the entire trip at 20 kilometers per hour?
*January 12, 2013 by Larry*

**math**

Phil is making a 40-kilometer canoe trip. If he travels at 30 kilometers per hour for the first 10 kilometers, and then at 15 kilometers per hour for the rest of the trip, how many minutes more will it take him then if he travels the entire trip at 20 kilometers per hour?
*January 13, 2013 by Larry*

**Math**

The Pioneer 10 spacecraft passed the planet Jupiter on December 12, 1973, and exited the solar system on June 14, 1983. The craft traveled from Mars to Jupiter, a distance of approximately 1 billion kilometers, in one year and nine months. a.Calculate the approximate speed of ...
*November 17, 2013 by Aubrey*

**Geometry**

A satellite has-recently been placed in a nearly circular orbit 2000 kilometers above the earth’s surface. Given that the radius of the earth is approximately 6400 kilometers and that the satellite completes its orbit in 12 hours, calculate the speed of the satellite in ...
*May 17, 2011 by Keenan*

**algebra**

1)Simplify:(3x^0y^-4)(2x^2y)^3 answer=6x^6 over y 2)Simplify:2x^2y^5z^-4 over 8x^6yz^3 answer= y^4 over 4x^4z 3)Saturn is 1.4 x 10^9 kilometers away from the sun. If light travels 3.0 x 10^4 km per second,how long does it take light from the sun to reach saturn? Express the ...
*August 1, 2007 by erin*

**Math**

Two airplanes leave St. Louis at the same time and fly in opposite directions. If one travels at 500 kilometers per hour, and the other at 600 kilometers per hour, how long will it take for them to be 1925 kilometers apart?
*October 29, 2013 by Miah*

**Math**

Two airplanes leave St. Louis at the same time and fly in opposite directions. If one travels at 500 kilometers per hour, and the other at 600 kilometers per hour, how long will it take for them to be 1925 kilometers apart?
*October 29, 2013 by Miah*

**math**

when the temperature is 68 degrees F, the speed of sound in the air is approximately 343 meters per second. Approximately how many kilometers does sound travel in five seconds
*May 13, 2014 by I NEED HELP FAST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!*

**math**

two horses gallop off in the sam direction. Trigger travels25 kilometers per hour. Silver travels 30 kilometers per hour. How long before the horses are 3 kilometers apart?
*November 21, 2011 by jordan*

**science question?**

can someone explain this to me? When the temperature is 68°F, the speed of sound in air is approximately 343 meters per second. Approximately how many kilometers does sound travel in five seconds?
*April 2, 2014 by matt*

**math 7th**

When the temperature is 68°F, the speed of sound in air is approximately 343 meters per second. Approximately how many kilometers does sound travel in five seconds? Can some one help with the steps?
*April 24, 2013 by Chris*

**Chemistry**

Light travels at a speed of 3.00 times 10^10 cm/s. What is the speed of light in kilometers/hour?
*February 21, 2014 by Kelsi*

**Math**

Atmospheric pressure changes as you rise above earth's surface. At an altitude of h kilometers, where 0<h<80, the pressure P is newtons per square centimeter is approximately modeled by the function P(h)=10.31e^(-0.116h). What is the approximate pressure at 50 kilometers...
*November 8, 2011 by Dawn*

**math**

Samantha’s speedometer reads in kilometers per hour. If the legal speed limit is 55 mi/h, how fast can she drive? How should I set this up? 160 kilometers per hour is 100 miles 55 miles is 88 kilometers. Here in New Zealand we are in kilometers
*May 28, 2007 by Ron*

**Math/Algebra**

Delivery company charges $10 plus 40¢ per kilometer or part of a kilometer. Find the cost for a trip of: a.5 kilometers b.7.5 kilometers c.3.2 kilometers d.Graph the ordered pairs (kilometers, cost). Is this a function?
*January 29, 2014 by Judy Conrad*

**Ed**

In a AAA map of Ohio, 1 inch equals approximately 10 miles or 18 kilometers. If the distance on the map between Paulding and Eaton is 9.8 inches, how many kilometers is it between the two towns.
*January 12, 2010 by Lisa*

**Math**

In a AAA map of Ohio, 1 inch equals approximately 10 miles or 18 kilometers. If the distance on the map between Paulding and Eaton is 9.8 inches, how many kilometers is it between the two towns?
*April 21, 2010 by Lisa*

**Math**

In a AAA map of Ohio, 1 inch equals approximately 10 miles or 18 kilometers. If the distance on the map between Pauling and Eaton is 9.8 inches, how many kilometers is it between the two towns?
*November 11, 2013 by Brittany*

**math**

Andrea made a car trip of 440 Kilometers. She averaged 54 Kilometers per hour for the frst part of the trip and 80 kilometers per hour for the secound part. If the total trip took 6 hours, how long was she traveling at 80 kilometers per hour?
*February 23, 2012 by mercy*

**MATH**

Andrea made a car trip of 440 Kilometers. She averaged 54 Kilometers per hour for the frst part of the trip and 80 kilometers per hour for the secound part. If the total trip took 6 hours, how long was she traveling at 80 kilometers per hour?
*February 23, 2012 by mercy*

**algebra word problem**

The mass of Saturn is about 5.688 10^23 metric tons. The mass of the sun is about 1.998 x 10^27 metric tons. About how many times the mass of Saturn is the mass of the sun? Give answer in scientific notation. The mass of the sun is about ----- times the mass of Saturn. COULD ...
*December 4, 2008 by pj*

**physics**

a 50 kg person is standing on mercury. mercury's mass is .0553 times the earths mass and has a radius of 2439 kilometers a. what is the persons weight on saturn b. what is the persons mass on saturn how do i solve this, i dont need the answers, just an explanation
*November 14, 2008 by kim*

**math**

light from the sun takes approximately 8 minutes to reach earth. If the light travels at a speed of 3 x 10 raised to 8 meters / second, calculate to 3 significant figures the distance from the sun to the earth
*September 29, 2013 by chetan*

**math**

Saturn is 6 times further from the Sun than Mars. Define a variable and write and expression for the distance of Saturn from the Sun.
*September 8, 2010 by Tammy*

**Science**

Earth travels around the sun at a spreed of 30,000 meters per second. Express this in kilometers per hour.
*May 15, 2014 by Phillip*

**Math**

a bus travels 240 kilometers at 60 kph and then returns at 40 kph.. what is the average speed in kilometers per hour for the round trip?
*August 13, 2013 by Mae*

**math**

Saturn is 6 times further from the Sun than Mars. Define a variable and write and expression for the distance of Saturn from the Sun. Not the same person
*September 8, 2010 by James*

**Math**

The earth is approximately a sphere. It's diameter is about 12730km. Water covers approximately 66% of the earths surface. How many square kilometers of land covers the earths?
*August 31, 2012 by Danielle*

**Pre algebra**

A cyclist rides her bike at a speed of kilometers per hour. What is this speed in kilometers per minute? How many kilometers will the cyclist travel in minutes? Do not round your answers.
*April 26, 2014 by David*

**physics**

Its 80 kilometers from point A to point B. Someone travels at an average speed of 40 kilometers per day and takes a negligible amount of time at point B to turn around to head back to point A. At what average speed must the person travel back to point A so that for the entire ...
*January 29, 2012 by Anonymous*

**algebra 2**

The mass of Saturn is about 5.688 10^23 metric tons. The mass of the sun is about 1.998 x 10^27 metric tons. About how many times the mass of Saturn is the mass of the sun? Give answer in scientific notation. The mass of the sun is about ----- times the mass of Saturn.
*June 13, 2010 by at*

**math**

One mile is equal to: A} 1.61 kilometers B} 3.52 kilometers C} 0.91 kilometers D} 2.34 kilometers
*February 13, 2010 by matty*

**radio message**

The nearest star beyond the sun is Alpha Centauri, 4.2 x 1016 meters away. If we received a radio message from the star today, how long ago would it have been sent? The distance that light travels in a vacuum in one year, approximately 9.46 trillion (9.46 × 1012) kilometers ...
*June 28, 2005 by Jarrad Schomaker*

**chemistry**

Light travels at a speed of 3.00 * 10 to the power of 10 cm/sec. What is the speed of light in Kilometers per hour?
*April 27, 2008 by tina*

**Math**

Two planes started at the same time from two airports that are 3600 kilometers apart and flew toward each other. One plane flew at 792 kilometers and the other flew at 888 kilometers per hour. In how many hours were the planes still 240 kilometers part?
*October 22, 2009 by Keanu*

**Geometry**

11-1 Lines that Intersect Circles 15. Olympus Mons's peak rises 25 kilometers above the surface of the planet Mars. The diameter of Mars is approximately 6,794 kilometers. What is the distance from the peak of Olympus Mons to the horizon to the nearest kilometer?
*March 19, 2012 by Ariel*

**calculus**

At noon, you and I start at the same place, and then you head east at a speed of 5 kilometers per hour, and I head north at a speed of 4 kilometers per hour. After two hours, how fast are we moving apart, in kilometers per hour?
*February 23, 2013 by lisa*

**MATH ANALYSIS**

How do i do this? According to Kepler's Laws, planets have elliptical orbits, with the sun at one of the foci. The farthest Pluto gets from the sun is 7.4 billion kilometers. The closest it gets to the sun is 4.4 billion kilometers. Find the equation of the orbit of Pluto.
*December 7, 2009 by anonymous*

**Math**

A woman rides her bicycle from her house to and from a lake. It takes her 1 1/2 hours to ride to the lake and 1 3/4 hours to ride back. She rides downhill at 12 kilometers per hour, on level ground at 8 kilometers per hour, and uphill at 6 kilometers per hour. What is the ...
*May 7, 2013 by Bob *

**Algebra**

1. A car travels 20 kilometers per hour faster than a second car. The first car covers 180 kilometers in the same time the second covers 135 kilometers. What is the average speed of each car? 2. The tens' digit of a two-digit number is one more than its units' digit. If the ...
*October 11, 2011 by cassie*

**GPH111**

On a map with a scale of 1:50,000, a measured distance of 7.5 centimeters represents an actual distance of :_____ kilometers Do I just times this to get 375,000 kilometers?
*March 9, 2012 by Jazmyne*

**algebra II**

The Chunnel connects the United Kingdom and France by a railway tunnel under the English Channel. The British started tunneling 2.5 months before the French and averaged 0.63 Kilometer per month. The French averaged 0.47 kilometer per month. When the two sides met, they had ...
*August 26, 2008 by Ashley*

**statistics**

A construction zone on Kings Road has a posted speed of 45 kilometers per hour. The speeds of vehicle passing through this construction zone are normally distributed with a mean of 46 kilometers per hour and a standard deviation of 4 kilometers per hour. Find the percentage ...
*May 11, 2012 by Nesa*

**statistics**

It is claimed that an automobile is driven on the average more than 20,000 kilometers per year. Random sample of 10 automobile owners are asked to keep a record of the kilometers they travel. If the sample mean and standard deviation of automobile driven are found to be 23,500...
*June 3, 2011 by Ali*

**algebra**

David walked 19 kilometers. The first part of the walk was at 5kph and the rest at 3kph. he would have covered 2 kilometers less if he had reversed the rates, that is, if he had walked at 3kph and at 5kph for the same times that he actually walked at 5kph and 3kph, ...
*December 7, 2008 by jackie*

**math**

An observer is located on the ground 6 kilometers from the point where a space shuttle is launched (vertically). When the shuttle is 8 kilometers high, it is travelling at 500 kilometers per hour. Determine, for that moment, the rate at which the distance between the observer ...
*April 26, 2013 by Thien Nguyen*

**ALGEBRA**

If traveling at r kilometers per hour for t hours, a driver will travel rt kilometers. How far will Danny travel in 4 hours at a speed of 99 kilometers per hour?
*September 17, 2009 by ggift*

**Math**

Traveling at r kilometers per hour for t hours, a driver will travel rt kilometers. How far will Danny travel in 3 hours at a speed of 51 kilometers per hour?
*February 17, 2012 by Andrew12*

**Math**

A boat moves 7 kilometers upstream in the same amount of time it moves 17 kilometers downstream. If the rate of the current is 9 kilometers per hour, find the rate of the boat in still water.
*May 4, 2011 by Andrew*

**math**

How many kilometers can light travel in 1 year? How many kilometers can light travel in 365.25 days? Show me Thank You
*February 1, 2012 by glenn help help help*

**Statistics**

A random sample of 16 mid-sized cars tested for fuel consumption gave a mean of 26.4 kilometers per liter with a standard deviation of 2.3 kilometers per liter. i) Assuming that the kilometers per liter given by all mid-sized cars have a normal distribution, find a 99% ...
*May 11, 2012 by Nesa*

**5th grade**

one light year is about 9 trillion kilometers . arctus is a star that is 37 light years from earth.if you are 11 years old now,how old will you be when light that is leaving arcturus today reaches earth. how far in kilometers willit have traveled .sow your work.
*April 25, 2010 by cheyenne*

**astrophysics**

1) Every second the Sun outputs 3.90* 10^26 Joules of energy. Power is energy output per unit time and is given in units of Watts (W) where 1 W = 1 Joule per second. The Sun's power output is therefore 3.90*10^26 Watts. This is called the solar luminosity. As this energy ...
*November 24, 2009 by Easha*

**astrophysics**

1) Every second the Sun outputs 3.90* 10^26 Joules of energy. Power is energy output per unit time and is given in units of Watts (W) where 1 W = 1 Joule per second. The Sun's power output is therefore 3.90*10^26 Watts. This is called the solar luminosity. As this energy ...
*November 24, 2009 by Easha*

**Math**

How long did it take the trip if Jay drove 340 kilometers at the average rate of 68 kilometers per hour?
*March 8, 2012 by Antonio*

**algebra**

Mr. Anders and Ms. Rich each drove home from a business meeting. Mr. Anders traveled east at 100 Kilometers per and hour and Ms. Rich traveled west at 80 kilometers per hour. In how many hours were they 100 kilometers apart?
*September 2, 2010 by Mindy*

**Math**

An airplane has an airspeed of 724 kilometers per hour at a bearing of 30 degrees.The wind velocity is 32 kilometers per hour from the west. What are the groundspeed and the direction of the plane?
*February 16, 2011 by Matt*

**Math**

An airplane has an airspeed of 724 kilometers per hour at a bearing of 30 degrees.The wind velocity is 32 kilometers per hour from the west. What are the groundspeed and the direction of the plane?
*February 18, 2011 by Kourt*

**math**

5.Escape velocity is the speed necessary to escape the gravitational pull of a plant. The escape velocity of Earth is 11.3 kilometers per second, while the escape velocity of Saturn is 310% of that. What is the escape velocity of Saturn?
*July 8, 2014 by Johnny *

**Math- Please Help!!**

An airplane has an airspeed of 724 kilometers per hour at a bearing of 30 degrees.The wind velocity is 32 kilometers per hour from the west. What are the groundspeed and the direction of the plane?
*February 18, 2011 by Kourt*

**algebra**

Write an algebraic expression for the verbal description. The travel time for a plane traveling at a rate of r kilometers per hour for 820 kilometers
*December 18, 2012 by Anonymous*

**Algebra**

2. The equation D=3.59 (sqrt)h gives the distance, D, in kilometers that a person can see to the horizon from a height, h, in meters. a. Solve this equation for h. b. Mount Evans in the Rocky Mountain National Park, is approximately 4,450 meters in elevation. How far can you ...
*October 21, 2011 by Student 315*

**pre-calculus**

A developer wants to build homes on a rectangular plot of land 4 kilometers long and 3 kilometers wide. In this part of the city, regulations require a greenbelt of uniform width along two adjacent sides. The greenbelt must be 10 times the area of the development. find the ...
*October 14, 2011 by jordan*

**statistics**

What would you guess the value of the correlation coefficient to be for the pair of variables: "number of man-hours worked" and "number of units of work completed"? a) approximately 0.9 b) approximately 0.4 c) approximately 0.0 d) approximately -0.4 e) approximately -0.9
*August 2, 2011 by Anonymous*

**Math**

Zaidi drove 9.8 kilometers on Monday and 7.39 kilometers on Tuesday. What is the total number of kilometers she drove.
*March 31, 2012 by Tye*

**Chemistry**

The velocity of light is 1.86 × 108 mi/hr. The distance of Mercury from the Sun is approximately 5.78 × 107 km. How many minutes will it take for light from the Sun to travel to Mercury?
*February 3, 2011 by Ang*

**Calc**

A plane that is flying horizontally at an altitude of 6 kilometers and a speed of 680 kilometers per hour passes directly over a radar station. How fast is the distance between the plane and the radar station increasing when the distance between the two is 9 kilometers
*October 20, 2009 by Georgia*

**calculus**

A plane that is flying horizontally at an altitude of 6 kilometers and a speed of 570 kilometers per hour passes directly over a radar station. How fast is the distance between the plane and the radar station increasing when the distance between the two is 14 kilometers
*October 28, 2013 by Matr*

**physics**

light travels at a constant speed of 3x10^11 centimeters/sec. how long does it take light to reach the earth a distance of 1.5x10^8 kilometers give your answer in seconds and minutes.
*October 15, 2011 by help*

**Science**

One light year is about 9 trillion kilometers. Arcturus is a star that is 37 light years from Earth. If you are about 11 years old now, how old will you be when light that is leaving Arcturus today reached Earth? How far, in kilometers, will it have traveled? please explain ...
*December 16, 2013 by Jane*

**Science 2**

One light year is about 9 trillion kilometers. Arcturus is a star that is 37 light years from earth. If you are about 11 years old now , how old will you be when light that is leaving. Arcturus today reaches Earth ? How far, in kilometers, will it have traveled? Show your work...
*May 10, 2014 by Jenny 2*

**Algebra**

An executive flew in the corporate jet to a meeting in a city 1700 kilometers away. After traveling the same amount of time on the return flight, the pilot mentioned that they still had 300 kilometers to go. The air speed of the plane was 600 kilometers per hour. How fast was ...
*July 1, 2013 by Jack*

**help i have no idea!!!!!!**

3.Sam is a mailman who delivers mail in a mail truck. His route is 2 kilometers long. He usually starts his route at 8:00 am and finishes by 12:00pm If Sam decided to get a bigger route that is 12 kilometers long, what does his average speed need to be to start and finish at ...
*March 18, 2014 by eduarda*

**chemistry**

The proton has a radius of approximately 1.0 times 10^{ - 13} cm and a mass of 1.7 times 10^{ - 24} g. Determine the density of a proton. For a sphere V = (4/3)times pi r^3.
*September 5, 2010 by Mely*

**Algebra**

Billye ran to town at 8 kilometers per hour and then walked back home at 3 kilometers per hour. How far was it to town if the round trip took 11 hours?
*December 7, 2007 by Anthony*

**physics **

What force is required to accelerate a 950 kilogram car 20 kilometers per hour to 45 kilometers per hour in 7 seconds? How far does the car travel during its acceleration?
*July 5, 2012 by Andrew Moore*

**College Algebra**

An executive flew in the corporate jet to a meeting in a city 1500 kilometers away. After traveling the same amount of time on the return flight, the pilot mentioned that they still had 300 kilometers to go. The air speed of the plane was 600 kilometers per hour. How fast was ...
*November 20, 2007 by Courtney*

**not sure**

many american cars feture speedometers that show kilometers per hour. If you are required to drive 55 miles and you know that one kilometer is approximately 5/8 of a mile, how many kilometers would you cover in that journey? 800 but how and why? nevermind. I just got it right ...
*July 25, 2007 by chris*

**math**

Edna and Nancy leave the house of a common friend at the same time and walk for 4 hours. Edna walks due east at the average rate of 4 kilometers per hour and Nancy walks due north at the average rate of 3 kilometers per hour. What is the straight-line distance between them in...
*October 27, 2008 by Sasha*

**Precalculus/Trigonometry**

How can I write a polynomial equation for this problem and draw a labeled diagram? A developer wants to build homes on a rectangular plot of land 4 kilometers long and 3 kilometers wide. In this part of the city, regulations require a greenbelt of uniform width along two ...
*October 27, 2007 by Amanda*

**Math**

Light travels at a speed of about 186,000 miles per second. Sound travels at a speed of about 1,087 feet per second. How many times faster light travels than sound.
*November 3, 2010 by Rose*

**math**

It takes mary x hours to travel 100 kilometers. If she increases her speed by 5 kilometers per hour, the journey will take her 3 hours less time. Find x.
*January 24, 2011 by Taylor*

**math**

it was 96 kilometers from Perry to medford. David raced to Medford and idled back.If the round trip took 8 hours what was his average speed in kilometers per hour
*January 7, 2013 by jasmine*

**math**

if two dice are rolled 360 times, approximately how many times should you expect a sum of 7
*May 10, 2010 by tk*

**statistics**

A random sample of 16 mid-sized cars tested for fuel consumption gave a mean of 26.4 kilometers per liter with a standard deviation of 2.3 kilometers per liter. i) Assuming that the kilometers per liter given by all mid-sized cars have a normal distribution, find a 99% ...
*May 10, 2012 by Koia*

**physics**

he speed of light in a vacuum is about 3.00 108 m/s how many kilometers a pulse from a laser beam travels in exactly 3.9 hours.
*September 5, 2011 by Anonymous*

**Socials **

How far is it in kilometers from kamloops BC to Edmonton Alberta? How far is it in kilometers from Singapore to Kuala Lumpur? How far is it in kilometers from Singapore to Medan? What is located at 105 east and 3 south?
*February 10, 2014 by Roma*

**Math**

Light travels approximately one foot in a nanosecond. How far does light travel in a microsecond?
*January 7, 2013 by Not telling you*

**Physics **

The surface of the Sun is approximately 5,650 K, and the temperature of the Earth's surface is approximately 295 K. What entropy change occurs when 6,000 J of energy is transferred by heat from the Sun to the Earth? ______J/K
*November 26, 2012 by Sally*

**Physics **

The surface of the Sun is approximately 5,650 K, and the temperature of the Earth's surface is approximately 295 K. What entropy change occurs when 6,000 J of energy is transferred by heat from the Sun to the Earth? (J/K)
*November 26, 2012 by Sam*

**Precalculus**

Rosea drives her car 30 kilometers to the train station, where she boards a train to complete her trip. The total trip is 120 kilometers. The average speed of the train is 20 kilometers per hour faster than that of the car. At what speed must she drive her car if the total ...
*March 11, 2010 by Alonzo*

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