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A car starting from rest is accelerated at constant rate until it attains a speed of \( 16 \mathrm{~m} / \mathrm{s} \). It moves
P with the constant speed \( 16 \mathrm{~m} / \mathrm{s} \) for some time

W and then it is retarded at other constant rate until it comes to rest. Considering that the car moves with constant speed for half of the time of total journey, what will be the average speed of the car for the whole journey (in \( \mathrm{m} / \mathrm{s} \) ) ?
(1) 8
(2) 12
(3) 9
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