Question

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

Answer 1

Step-by-step explanation:

Rate of flow of the stream = r kmph

Rowing speed = 18 kmph

Distance traveled upstream or downstream = d km

Time to row upstream = d/(r-18) = 3* d/(r+18)

Solving, r = 38 kmph

Answer 2

The rate of stream is 9 km/hr.

Step-by-step explanation:

Since we have given that

Speed of boat in still water = 18 kmph

It takes him thrice as long as row up as to row down the river.

So, n = 3 (say0

Let the speed of boat in still water be 'x'

Let the speed of current be 'y'.

So, we get that

$x=y\times (\dfrac{n+1}{n-1})\\\\18=y\times \dfrac{3+1}{3-1}\\\\18=y\times \dfrac{4}{2}\\\\18=2y\\\\y=\dfrac{18}{2}\\\\y=9\ km/hr$

Hence, the rate of stream is 9 km/hr.

# learn more:

A man can row 18kmph in still water. it takes him thrice as long as to row up as to row down the river. find the rate of stream (in kmph).

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