A swimmer heads directly across a river, swimming at 1.30 m/s relative to the water. She arrives at a point 43.0 m downstream from the point directly across the river, 66.0 m wide. What is the speed of the river current?
What is the swimmer's speed relative to the shore?
In what direction (as an angle relative to a direct line across the river) should the swimmer aim instead, so that she arrives at the point directly opposite her starting point?