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A particle moves along \( \mathrm{x} \)-axis with speed \( 6 \mathrm{~m} / \mathrm{s} \) for the first half distance of a journey and the second
P half distance with a speed \( 3 \mathrm{~m} / \mathrm{s} \). The average speed

W in the total journey is
(1) \( 5 \mathrm{~m} / \mathrm{s} \)
(2) \( 4.5 \mathrm{~m} / \mathrm{s} \)
(3) \( 4 \mathrm{~m} / \mathrm{s} \)
(4) \( 2 \mathrm{~m} / \mathrm{s} \)
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