If a man's rate with the current is 12 km/hr and the rate of the current is 3/2 km/hr, then his rate against the current is:

13

7

9

None

Speed of the man downstream = 12 km/hr Speed of the stream = 3/2 km/hr Let the speed of the man upstream = x km/hr We have, Speed of the stream = (1/2) (Downstream Speed - Upstream Speed) => 3/2 = (1/2) (12 - x) => x = 12 - 3 = 9 km/hr

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