1. The problem statement, all variables and given/known data Two trains run in opposite directions on parallel tracks. Train A is 30 meters long and runs east to west at 60 mph. Train B is 45 meters long and runs west to east. It takes 0.5 seconds for the trains to pass each other. How fast is train B travelling? What is the velocity of train B relative to train A? 2. Relevant equations 3. The attempt at a solution I'm new to physics and lost with this problem. The first thing I did was convert mph to m/s. (60 miles/hour x 1609m/1m x 1 hour/3600s). I got 26.82 m/s but I don't know where to go from there?