Point B is located across the river from point A and at a 42.0 angle upstream from A. A boat travels from point A to point B, sailing at 18.0 km/h relative to the water. The current in the river flows at 5.60 km/h. The river is 1.45 km wide. (a) At what angle should the boat head? (b) What will be the boat's speed relative to the ground? (c) How much time does the trip from point A to point B take