if a boat goes 7 km upstream in 42 minutes and the speed of the stream is 3 km

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Question

if a boat goes 7 km upstream in 42 minutes and the speed of the stream is 3 kmph, then the speed of the boat in still water is :

Options:

A . 4.2 km/hr

B . 9 km/hr

C . 13 km/hr

D . 21 km/hr

Answer: Option C
Explanation :

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