A river is flowing at 3mps.A man can swim in still water at a speed of 6mps.The angle at which the bank at which the swimmer should start ,so that he may cross the river along the shortest distance is?

Answer 1

Say the river runs south
We want to end up going east

Our velocity north will be 6 cos T - 3 = 0
if T is angle from north
cos T = 1/2
T = 60 degrees from north which is 30 degrees from straight across