$A$ man can swim $3 \text{ km/h}$ in still water. If the velocity of the stream is $2 \text{ km/h}$,the time taken by him to swim to a place $10 \text{ km}$ upstream and back is (in hours):
- A$8 \frac{1}{3}$
- B$9 \frac{1}{5}$
- C$10$
- D$12$
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