A man takes 3 hours 45 minutes to row a boat 22.5 km downstream of a river and 2 hours 30 minutes to cover a distance of 10 km up stream . Find the speed of the river current in km /hr.
A. 1 km/hr
B. 2 km/ hr
C. 3 km /hr
D. 4km/ hr
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সঠিক উত্তরঃ
A.
1 km/hr
Explanation:
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