A boatman can row 3 km against the stream in 20 minutes and return in 18 minutes. Find the rate of current ?

1/3 kmph
2/3 kmph
1/4 kmph
1/2 kmph

Correct Answer: 1/2 kmph

Explanation:

Speed in upstream = Distance / Time = 3 x 60/20 = 9 km/hr.

Speed in downstream = 3 x 60/18 = 10 km/hr

Rate of current = (10-9)/2 = 1/2 km/hr.

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