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

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 . 10

B . 6

C . 5

D . 4

Answer: Option C
Explanation :

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