A boy walks to his school at a distance of 6km with a constant speed of 2.5 kmph and walks back with a constant speed of 4 kmph. His average spped for the round trip expressed in kmph is
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Average speed is given by total distance divided by total time taken. This is average speed not average velocity. Time taken for travelling 6km with 2.5kmph is 2.4 seconds. Time taken to travel 6km with 4kmph is 1.5secs. Total distance=12km. 12/3.9=3.07kmph is the average speed.
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