A boat can travel with a speed of 13 km/hr in still water . If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream .
A. 4 hours
B. 3 hours
C. 5 hours
D. 2 hours
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সঠিক উত্তরঃ
A.
4 hours
Explanation:
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