JEE Main 2019 Physics question
The stream of a river is flowing with a speed of 2 km/h. A swimmer can swim at a speed of 4 km/h. What should be the direction of the swimmer with respect to the flow of the river to cross the river straight?
Answer: (D)
Solution
upstream from the normal, i.e. 90° + 30° = 120° with the flow.