An eastbound train and a westbound train meet each other on parallel tracks heading in opposite directions. The eastbound train travels 4 miles per hour faster than the westbound train. After 2.5 hours, they are 320 miles apart. At what speeds are the two trains traveling?

Answer 1

If the slower train has speed x, then the two are moving apart at speed x + x+4

So, since distance = speed * time,
(2x+4)*2.5 = 320