Question
A boat covers 36 km downstream in 2 hours, and it takes
3 hours to cover the same distance upstream. What is the speed of the current?Solution
Speed downstream = Distance / Time = 36/2 = 18 km/h. Speed upstream = Distance / Time = 36/3 = 12 km/h. Speed of current = (Speed downstream - Speed upstream) / 2 = (18 - 12) / 2 = 6/2 = 3 km/h. Correct Option: b
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