Question

A river of width 200 flows at 5 metre per second a man crosses the river in the shortest time of 25 seconds if there is no flow and screen with the same velocity the time taken to cross the river is

Answer 1

25 sec

Explanation:

we know that;

T=d/VsrCos¢

(T)min=d/VsrCos0

means,

(T)min=d/Vsr

25=200/Vsr

Vsr=8 m/s

Now Time taken to cross the river when there is no flow of River will be;

Y-direction.

V=VsrCos¢

=VsrCos0

=Vsr

So, Time taken=distance/speed

T=200/8

T=25 sec

Answer 2

Explanation:

25 sec is the correct answer