A boat that travels at a speed of 6.75 m/s in still water is to go directly

Question:

A boat that travels at a speed of 6.75 m/s in still water is to go directly across a river and back (Fig. 3.38). The current flows at 0.50 m/s.
(a) At what angle(s) must the boat be steered?
(b) How long does it take to make the round trip? (Assume that the boat€™s speed is constant at all times, and neglect turnaround time.)