A man can row 9 1/3 km/hr in still water and he finds that is thrice as much tim

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A man can row 9 1/3 km/hr in still water and he finds that is thrice as much time to row u p than as to row down the same distance in river. The speed of the current is:________?

Options:

A . 3 1/3 km/hr

B . 3 1/9 km/hr

C . 1 ¼ km/hr

D . 4 2/3 km/hr

Answer: Option D
LET SPEED UPSTREAM = X KM/HR
SPEED DOWNSTREAM = 3X KM/HR
SPEED IN STILL WATER = ½ (X+3X) KM/HR = 2X KM/HR
SPEED OF CURRENT = ½ (3X-X) KM/HR = X KM/HR
2X = 28/3 OR X = 14/3 = 4 2/3 KM/HR

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