A boat going down stream crosses a floating body at certain point P. After 1 hour it turned back and after sometime it crossed that floating body at a distance of $12$ km from P. If velocity of boat in still water is constant, velocity of the stream is

The float moves with the stream velocity, and the boat travels away from the float for 1 hour, resulting in a total round-trip time of 2 hours from the moment it passed point P. In this 2-hour period, the float drifts 12 km from point P. Using the basic speed formula, velocity equals distance divided by time, the stream velocity is 12 km divided by 2 hours, which equals 6 kmph, so the correct option is D.

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