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Question
 a boat takes 4 hours for travelling downstream from point a to point b and coming back to pint a upstream. if the velocity of the stream is 2 km/hr and the speed of the boat in still water is 4 km/hr.
Options:
A .  6 Km
B .  7 Km
C .  9 Km
D .  8 Km
Answer: Option C
Explanation :

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