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Question -

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. [NCERT Exemplar]



Answer -

Let the speed of the stream be v km/h
Given that, a person rowing in still water = 5 km/h
The speed of a person rowing in downstream = (5 + v) km/h
and the speed of a person Has rowing in upstream = (5 – v) km/h
Now, the person taken time to cover 40 km downstream,

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