A boy goes from A to B with a velocity of 20 m/min and comes back from B to A

A boy goes from A to B with a velocity of 20 m/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
(a) 24 m/min(b) 25 m/s(c) Zero(d) 20 m/min

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