A man rows at 6 km/hr in still water and 4.5km/hr against current. His rate along the current is :
A. 9.5 km/hr
B. 7.5 km/hr
C. 7 km/hr
D. 5.25 km/hr
E. None of these
সঠিক উত্তরঃ
B.
7.5 km/hr
Explanation:
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