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

Quantitative Aptitude ( CCS) Boats and Streams

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

1/2 km/hr

2/3 km/hr

5/2 km/hr

None of these

Speed in upstream = Distance / Time = 3 x 60/20 = 6 km/hr.

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

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

Hence, option 1 is the correct answer.

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