a boatman can row 3 km against the stream in 20 minutes and return in | Examsbook

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

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

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Answer : 4. "1/2 kmph"
Explanation :
Answer: D) 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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