Objective question in Kinematics

A car A is travelling on a straight level road with a uniform speed of 60km/h.It is followed by another car B which is moving with a speed of 70 km/h.When the distance between them is 2.5 km, the car B is given a deceleration of 20km/{{h}^{2}}.After how much time will B catch up with A a) 1 hr b) 1/2 hr c) 1/4 hr d) 1/8 hr

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