A 020-Km Wide River Has a Uniform Flow Speed of 4

Multiple Choice

A 0.20-km wide river has a uniform flow speed of 4.0 m/s toward the east. It takes 20 s for a boat to cross the river to a point directly north of its departure point on the south bank. In what direction must the boat be pointed in order to accomplish this?

A) 23° west of north
B) 20° west of north
C) 24° west of north
D) 22° west of north
E) 17° west of north