Help!?!? I was born with two toenails on each toe!!?

one the top and one on the bottom of each toe. It has been a very distressing element of my life. My question is: "If Train A is moving east on the tracks at 80 mph, Train B is moving west at 60 mph, and they are originally 100 miles apart, where and when will they collide?" I need this for a homework problem. Thanks yahoo Answers!!!!