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A bus starts from rest and acceleration ...

A bus starts from rest and acceleration at a uniform rate `4 m//s^(2)` for certain time. It then moves with a constant speed for some time and finally retards at `4 m//s^(2)` to come to rest. Average speed of the bus during the total journey is 15 m/s and the total time is 20 sec. Time duration for which the car moves with constant speed is:

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