A man can cross 10 miles distance of a river in favor of the stream in 2 hours . He can come back against the stream along the same way in 5 hours . What is the average speed, in miles per hour, for the entire trip ?
A. 20/7
B. 10/7
C. 7/10
D. 7/20
E. None of these
সঠিক উত্তরঃ
A.
20/7
Explanation:
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