Question
A boy can swim in still water at a speed of 15 km/hr. If
the speed of the current would have been 9 km/hr, then the boy could swim 48 kmSolution
Rate downstream = 15 + 9 = 24 kmph Rate upstream = 15 – 9 = 6 kmph Time taken in swimming 48 km downstream = 48/24 = 2 hours Time taken in swimming 48 km upstream = 48/6 = 8 hours From, given options, boy can swim 48 km upstream in 8 hrs.
A boat takes a total of 6 hours to go 24 km downstream and return 24 km upstream. The stream speed is 3 km/h. Find the speed of the boat in still water.
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