A boat crosses a river, which is 60 meters wide in 15 seconds. Upon crossing, the boat, which had headed straight across the river, ended up 20 meters downstream.

A). What was the speed of the boat in still water?
B). At what speed does the river flow?
C). At what angle should the boat head to end up straight across the river?

I was wondering if you could let me know if my answers are correct:
Part A:
velocity of Boat w/ respect to water = 1.33 m/s

Part B:
speed of water w/ respect to shore = 59.996 m/s

Part C:
theta = 71.6 degrees

Are these answers correct?