A motorboat, whose speed in 15 km/hr in still water goes 30 km downstream and co

Question

A motorboat, whose speed in 15 km/hr in still water goes 30 km downstream and comes back in a total of 4 hours 30 minutes. The speed of the stream (in km/hr) is:

Options:

A . 4 km/hr

B . 5 km/hr

C . 6 km/hr

D . 10 km/hr

Answer: Option B

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