A person can row a boat d km upstream and the same distance downstream in 51 hrs Also he can row the boat 2d km upstream in 7 hours. He will row the 4 same distance downstream in

A person can row a boat d km upstream and the same distance downstream

1.	A person can row a boat d km upstream and the same distance downstream in 51 hrs Also he can row the boat 2d km upstream in 7 hours. He will row the 4 same distance downstream in
A.	4 hours
Answer» B.

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A person can row a boat d km upstream and the same distance downstream in 51 hrs Also he can row the boat 2d km upstream in 7 hours. He will row the 4 same distance downstream in

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