A boat goes 13 km upstream in 39 minutes. The speed of stream is 3 km/hr. The speed of boat in still water is:

23 kmph

25 kmph

27 kmph

none of the above

Speed of the boat upstream= 13 x 60/39= 20 km/hr Speed of the stream = 3 km/hr Let the speed of the boat in still water = x km/hr We have, x - 3 = 20 => x = 20 + 3 => x = 23 km/h

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