You are riding in a boat whose speed relative to the water is 7.4 m/s. The boat points at an angle of 24.8° upstream on a river flowing at 15.2 m/s. Find the time it takes for the boat to reach the opposite shore if the river is 26.1 m wide.

Answer 1

speed across = 7.4 cos 24.8

time = distance/speed
= 26.1 / 7.4 cos 24.8

the river speed only says how far downstream he will end up.