Question

A man rouring at a rate of 5km/h in still water takes thrice as much as time in going 40km down find the rate at which the river flows

Answer 1

Answer:

10kmph

Step-by-step explanation:

Let time t be time taken to move down the stream.

When moving in still water the velocity=5kmph

Time is 3t and distance=40km

So 5=40/3t......(1)

When moving down stream the relative velocity=5+v {v is of river}

So 5+v=40/t......(2)

From 1 and 2 we get v=10 kmph

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