A car starts moving rectilinearly, first with acceleration 5 m/s^2 (initial velocity is equal to 0 m/s), then uniformly, and finally, decelerating at the same rate (-5 m/s^2), till it comes to stop. The total time of motion is 25 seconds. The average velocity during that time is equal to 72 km/h. How long does the car move uniformly? (I want the working as well!)
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