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