a boat covers a certain distance downstream in 1 hour, while it comes back in

Question

a boat covers a certain distance downstream in 1 hour, while it comes back in 11⁄2 hours. if the speed of the stream be 3 kmph, what is the speed of the boat in still water?

Options:

A . 14 kmph

B . 15 kmph

C . 13 kmph

D . 12 kmph

Answer: Option B
Explanation :

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