A man can row at the rate of 4km/hr. in still water. If the time taken to row a certain distance upstream is 3 times as much as to row the same distance downstream, find the speed of the current.
Solution
Correct Answer: Option D
speed of the current = (n-1)/(n+1) X speed of the man =3-1/3+1 X 4 =1/2 X 4= 2 km/hr
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