A car, starting from rest, first moves with an acceleration of \( 5 \mathrm{~m} / \mathrm{s}^{2}...

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A car, starting from rest, first moves with an acceleration of \( 5 \mathrm{~m} / \mathrm{s}^{2} \) for sometime and then, after moving with a uniform speed for some time, starts decelerating at the same rate to come to rest in a total time of \( 25 \mathrm{sec} \). If the average velocity of the car over the whole journey is \( 20 \mathrm{~m} / \mathrm{s} \), for how long does it move with a uniform speed?
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