The speed of a boat when travelling downstream is 32 kmph whereas when travelling upstream it is 28 ...........

Quant (SSC) Boats and Streams

The speed of a boat when travelling downstream is 32 kmph whereas when travelling upstream it is 28 kmph. What is the speed of the boat in still water?

27 kmph

29 kmph

31 kmph

None of these

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Explanation:

x = 1/2 (boat’s rate with current + his rate against current)
Given,
x is the boat’s rate in still water
By the short trick approach, we get
x = 1/2 (32 + 28)
= 60/2 = 30 km/hr