SOLUTION: A boat can travel at a speed of 15 kph in still water. The boat travels 40 km downstream on a river at the same time it takes to travel 25 km upstream. What is the speed of the riv
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Question 388885: A boat can travel at a speed of 15 kph in still water. The boat travels 40 km downstream on a river at the same time it takes to travel 25 km upstream. What is the speed of the river?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
A boat can travel at a speed of 15 kph in still water. The boat travels 40 km downstream on a river at the same time it takes to travel 25 km upstream. What is the speed of the river?
speed of boat = 15 kph
speed of river = x kph
...
d downstream = 40 km
d upstream = 25 km
..
time upstream = time downstream
40/15+x = 25/15-x
cross multiply
40(15-x)=25(15+x)
600-40x=375+25x
600-375=40x+25x
225=65x
/65
3.46 km/h speed of current
..
m.ananth@hotmail.ca
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