At this rate, if two trains depart their depot at the same time, one leaving Wichita eastbound at 45 mph and the other departing St. Louis westbound at 58 mph,

At this rate, if two trains depart their depot at the same time, one leaving Wichita eastbound at 45 mph and the other departing St. Louis westbound at 58 mph, we may never know where they are going to meet, let alone how long it will take them to get there.