A 0.20-km wide river has a uniform flow speed of 3.0 m/s toward the east. A boat with a speed of 8.0 m/s relative to the water leaves the south bank and heads in such a way that it crosses to a point directly north of its departure point. How long does it take the boat to cross the river?
A. 29 s
B. 23 s
C. 25 s
D. 27 s
E. 17 s
Answer: D
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