The stream of a river is flowing with a speed of 2 k m h - 1 . A swimmer can swim at a speed of 4 km h - 1 . The direction of the swimmer with respect to the flow of the river, to cross the river straight, is

Step-by-step solution

To reach the point directly opposite to the starting point, the resultant velocity of swimmer should be as shown in figure. From figure sin ⁡ θ = 2 4 = 1 2 θ = 30 ° Angle with flow = 90 ° + 30 ° = 120 °