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

B . 5

C . 6

D . 10

Answer: Option B
Answer: (b).5

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