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Question
 a boat covers a certain distance downstream in 4 hours but takes 6 hours to return upstream to the starting point. if the speed of the stream be 3 km/hr, find the speed of the boat in still water
Options:
A .  15 km/hr
B .  12 km/hr
C .  13 km/hr
D .  14 km/hr
Answer: Option A
Explanation :

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