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