Question
A boy can swim in still water at a speed of 8 km/hr. If
the speed of the current would have been 3 km/hr, then the boy could swim 55 kmSolution
Rate downstream = 8 + 3 = 11 kmph Rate upstream = 8 – 3 = 5 kmph Time taken in swimming 55 km downstream = 55/11 = 5 hours Time taken in swimming 55 km upstream = 55/5 = 11 hours From, given options, boy can swim 55 km downstream in 5 hrs.
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