In Dhanmondi Lake the current flows at 3 kilometres per hour. The boatmen takes twice as long to travel upstream between two points as it does to travel downstream between the same two points. In still water what is the speed of the boat?
A. 3 miles per hour
B. 6 miles per hour
C. 9 miles per hour
D. 12 miles per hour
E. None of these
সঠিক উত্তরঃ
C.
9 miles per hour
Explanation:
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