Question

Two trains leave the station at the same time, one heading east and the other west. the eastbound train travels at 85 miles per hour. the westbound train travels at 75 miles per hour. how long will it take for the two trains to be 352 miles apart?

Answer 1

Since the trains area headed in completely opposite directions, the rate at which they gain distance from each other is simply equal to the sum of the magnitudes of their velocities, in this case 85 + 75 = 160 miles per hour. Therefore, the amount of time it will take for them to be 352 miles apart is 352/160 = 2.2 hours, or 2 hours and 12 minutes.