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A car moving at 160 km//h when passes th...

A car moving at `160 km//h` when passes the mark-A, driver applies brake and reduces its speed uniformly to `40 km//h` at mark-C. The mark are spaced at equal distances along the road as shown below.
At which part of the track the car has instantaneous speed of `100 km//h` ? Neglect the size of the car.

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