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Id really appreciate any help anybody can give me with this problem, its urgently needed and very very important, ive been stuck on it for about an hour and dont even know where to start:

Two cars A and B, each 5m in length, travel with constant velocity 20 m/s along a straight level road. The front of car A is 15m directly behind the rear of car B. Immediately on reaching a point P, each car decelerates at 4m/s^2.

1) Show that A collides with B

2) At what distance from P does the collision occur?

3) Show the motion of both cars on the same speed-time graph.

Thanks in advance for any help you can give