A person rowing at the rate of 5 km/h in still water, takes thrice as much time in
going 40 km upstream as in going 40 km downstream. Find the speed of the stream.
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Consider,
Speed of rowing by a person =5 km/hr.
Speed of stream =x km/hr
Upstream Speed =(5−x) km/hr
Downstream speed =(5+x) km/hr
According to the question,
⇒
5−x
40
=
5+x
3×40
⇒5+x=15−3x
⇒4x=10
⇒x=2.5 km/hr
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