Question

A person rowing at a rate of 5km/hr in still water tak thrice as much time in going 40 km upstream as in going 40km downstream. Find speed of stream.​

Answer 1

Answer:2.5km/h

Step-by-step explanation:

let x be the speed of stream

5+x=downstream

5-x upstream

40/5-x=3*(40/5+x)

5+x=3(5-x)

5+x=15-3x

x+3x=15-5

4x=10

x=2.5 km/hr