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A car A is travelling on a straight leve...

A car A is travelling on a straight level road with a uniform speed of 60 km/h. It is followed by another car B which in moving with a speed of 70 km/h. When the distance between then is 2.5km, the car B is given a deceleration of `20(km)/(h^2)`. After how much time will B catch up with A

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