2. 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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sorry I can't answer it because I can't understand it
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