Question

A river of 300 metre wide flows with the rate of 6 kilometre per hour a swimmer who can swim with rate of 10 kilometer per hour

Answer 1

Explanation:

d = 800 m = 0.8 km

Velocity of swimmer w.r.t. ground Vsg = 10 km/h

Vr = 5 km/h

Let the swimmer start swimming making an angle θ with the perpendicular to the flow of river.

Let time taken to cross the river = t

6 kilometre per hour a swimmer