a boat takes 9 hours to travel a distance upstream and takes 3 hours to travel

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Question

a boat takes 9 hours to travel a distance upstream and takes 3 hours to travel the same distance downstream. if the speed of the boat in still water is 4 km/hr, what is the velocity of the stream ?

Options:

A . 2 Km/hr

B . 4 Km/hr

C . 3 Km/hr

D . 6 Km/hr

Answer: Option A
Explanation :

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