Question 84

A man swim at 5 km per hour velocity in still water He takes 75 minutes to swim from position A to the position B and back in a river when it is flowing at 1 km per hour The distance between A and B is

Solution

Let the distance be x

Relative speed when travelling upstream = 5 - 1 = 4 kmph

Relative speed when travelling downstream = 5 + 1 = 6 kmph

Time taken = 75 minutes = 1.25 hours

So, x/4 + x/6 = 1.25

So, x = 3 kms

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