hi im new to this and i have a problem that im stumped on. Two trains, one travelling at 100km/h and the other at 128km/h, are headed towards one aanother along a straight level track. When the trains are 1.2km apart, each engineer sees the other train and applies the brakes. Both trains have equal, constant decelerations of 0.9 m/s^2. What is the distance they will be apart?