Question

The stream of a river is flowing with a speed of 2km/h. A swimmer can swim at a speed of 4km/h. What should be the direction of the swimmer with respect to the flow of the river to cross the river straight

Answer 1

Answer:

sin (alpha)= 2/4 => alpha=30

Explanation:

assume that water flow from right to left.

swimmer should swim toward the left with the direction of alpha compared to the river straight.