A boy goes from A to B with a speed of 20 m/min and comes back from B to A with a speed of 30 m/min. The average speed of the boy during the whole journey is *
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A boy goes from A to B with a velocity of 20m/min and comes back from B to A with a velocity of 30 m/min. the average velocity of the boy during the whole journey is : 24m/ min.
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