A man can row 18 kmph in still water

Asked by admin @ 16/08/2021 in Math viewed by 327 People

A man can row 18 km/hr in still water. It takes him thrice as long to row up as to row down the river. Find the rate of stream.

Answered by admin @ 16/08/2021

Answer:

9 km/hr

Step-by-step explanation:

Given A man can row 18 km/hr in still water. It takes him thrice as long to row up as to row down the river. Find the rate of stream.

Let man can row p km / hr up the river.

So he rows 3 p km down the river.

Now rate of water is 3 p + p = 4 p and in still water is 1/2 x 4 p = 2 p km / h

So 2 p = 18

p = 9 km / hr is rate of up the river and 9 x 3 = 27 km / hr is rate of down the river.

Now we need to find rate of stream which is

1/2 x (27 - 9)

1/2 x 18

9 km / hr

So rate of stream will be 9 km / hr

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