Question

A man can row 8km/h in still water and he finds that it takes him twice as long to row
up as to row down the stream. What is the rate of the stream.​

Answer 1

Answer:

the opposing force must be 4 km/hr

Step-by-step explanation:

As when it will cut through the rowing speed of 8 km/hr it will equate it to 4 km/hr and that's exactly the half of his speed in still water

Answer 2

Let rate of the stream =x km /h

upstream speed of boat=(8-×) km/hr

downstream speed of boat=(8+×) km/hr

let distance =D km

Time taken upstream =D/(8-×)

Time taken downstream =D/(8+×)

D/(8-×)=2D/(8+×)

(8+×)=2(8-×)

(8+×)=16-2x

x+2x=16-8

3x=8

x=2.67km/hr

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