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A particle moves in straight line in same direction for 20 seconds with velocity \( 3 \mathrm{~m} / \mathrm{s} \) and then moves
P with velocity \( 4 \mathrm{~m} / \mathrm{s} \) for another \( 20 \mathrm{sec} \) and finally

W moves with velocity \( 5 \mathrm{~m} / \mathrm{s} \) for next 20 seconds. What is the average velocity of the particle?
(1) \( 3 \mathrm{~m} / \mathrm{s} \)
(2) \( 4 \mathrm{~m} / \mathrm{s} \)
(3) \( 5 \mathrm{~m} / \mathrm{s} \)
(4) zero
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