The speed of a boat in still water is $6\, km/h$ and the speed of the stream is $1.5\, km/h$. $A$ man rows to a place at a distance of $22.5\, km$ and returns to the starting point. The total time taken by him is:
- A$10\, hours$
- B$4\, hours\, 10\, minutes$
- C$6\, hours\, 10\, minutes$
- D$8\, hours$
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