At 12:00 noon two trains pulled out of stations that were 350 miles apart and traveled toward each other on parallel tracks until they met. What was the total distance traveled by the trains in the last hour before they met?

(1) One of the trains traveled at a constant rate of 47.35 miles per hour

(2) One of the trains traveled at a constant rate of 57.65 miles per hour



I got this wrong on first glance, still don't understand why the answer is D. PLEASE HELP!!