The two trains face one other on adjacent tracks. They are primarily at rest, and their front ends are 40 m apart. The train on the left accelerates rightward at around 1.0 m/s2. The train on the right accelerates leftward at around 1.3 m/s2. (i) Explain how far does the train on the left travel before the front ends of the trains pass? (ii) When the trains are each 150 m in length, determine how long after the start are they fully past one another, supposing their accelerations are constant?