A car $A$ is travelling on a straight level road with a uniform speed of $60$$km/h.$It is followed by another car $B$ which is moving with a speed of $70$ $km/h.$When the distance between them is $2.5\, km$, the car $B$ is given a deceleration of $20$$km/{h^2}.$ After how much time will $ B$ catch up with $A$...........$hr$
- A$1$
- B$0.5$
- C$0.25$
- D$1/8$
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