1)Adam can swim at the rate of 2 km/h in still water.At what angle to the bank of a river must he head if he wants to swim directly across the river and the current in the river moves at the rate of 1 km/h?

2) A boat heads 15degrees west of of north with a water speed of 12 m/s. Determine its resultant velocity , relative to the ground, when it encounters a 5 m/s current from 15 degrees north of east.

Thank you in advance!