A swimmer heads directly across a river, swimming at 1.49 m/s relative to the water. She arrives at a point 42.0 m downstream from the point directly across the river, which is 65.8 m wide.
A.What is the speed of the river current?
B. What is the swimmer's speed relative to the shore?
C. In what direction should the swimmer head in order to arrive at the point directly opposite her starting point? Give your answer as the angle relative to the direction directly across the river.