a motorboat whose speed is 15 km/hr on still water goes 30 km downstream and c

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Question

a motorboat whose speed is 15 km/hr on 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
Explanation :

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