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
Answer: D
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