PHYSICS
posted by Reem .
A girl rows 10 km downstream in 2 h. Her return trip takes 4 h. How fast can she row in still water. in km/h?

PHYSICS 
Damon
rowing speed = v
speed upstream = (vc)
speed downstream = (v+c)
(v+c) * 2 = 10
(vc) * 4 = 10 or (vc) * 2 = 5
2 v + 2 c = 10
2 v  2 c = 5
add
4 v = 15
v = 15/4 = 3.75 km/hr
Respond to this Question
Similar Questions

Math
Sam rows up a river to camp in 3 hours. The next day he makes the return trip downstream in 1 hour. If he can row 2 mph in still water, how fast is the current? 
Math
3). Sam rows up a river to camp in three hours. The next day he makes the return trip downstream in one hour. If he can row two mph in still water, how fast is the current? 
math
a man rows downstream for one hour and 40 minutes on a river flowing at 2 miles per hour. on his returned trip he rows upstream for 5hours. find the distance that he traveled downstream and his speed of rowing in still water. 
algebra1
Sam rows up a river to camp in three hours.The next day he makes the return trip downstream in one hour. If he can row two mph in still water, how fast is the current? 
phisecs
A girl rows 11 km downstream in 2 h. Her return trip takes 4 h. How fast is the current. in km/h? 
phisecs
A girl rows 11 km downstream in 2 h. Her return trip takes 3 h. How fast can she row in still water. in km/h? 
PHYSICS
A girl rows 10 km downstream in 2 h. Her return trip takes 3 h. How fast is the current. in km/ 
Uniform Motion
A certain fish requires 3 hrs to swim 15km downstream. The return trip upstream takes 5 hrs. What is the speed of the fish still in water? 
algebra 2
Kate can row a boat 10 miles per hour in still water. in a river where the current is 5 miler per hour, it take her 4 hour longer to row a given distance upstream than to travel the same distance downstream. Find how long it takes … 
Math
A salmon swims 15 miles downstream from its birth to the ocean in 3 hours. The return trip upstream to spawn takes 5 hours. How fast does the salmon swim in still water?