Originally Posted by

**ellie_h** i have like 5 questions the same style and i cant do them, so if somebody could work through this 1 ill be really grateful.

Two trains A and B run on parallel striaght tracks. Initially both are at rest in the station and level with each other. At time *t=*0, A starts to move. It moves with constant acceleration for 12 sec up to a speed of 30m/s, and then moves at a constant speed of 30m/s. Train B starts to move in the same direction as A when t=40, where t is measure in seconds. It accelerates with the same initial acceleration as A, up to a speed of 60m/s. it then moves at a constant speed of 60m/s. Train B overtakes A after both have reached their maximum speed. Train B overtakes A when t = T.

We had to draw the speed time graphs of both trains for 0 ≤ t ≤ T.

The second part is find the value of T.