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

W another 20 seconds and finally 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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