Ariver flows due south with a speed of 2.10 m/s. a man steers a motorboat across the river; his velocity relative to the water is 4.50 m/s. the river is 600 m wide.

1. in what direction should the motorboat head in order to reach a point on the opposite bank directly east from the starting point? (the boat's speed relative to the water remains 4.50) answer needs to be in degrees north of east.

2. what is the velocity of the boat relative to the earth? m/s is the units (the book says the answer is 3.98 m/s

3. how much time is required to cross the river? s (sec) is the units ( the book says the answer is 151 s)