Two truck drivers leave a warehouse traveling in opposite di

Two truck drivers leave a warehouse traveling in opposite directions, one driving at 50 mph and one driving at 56 mph. If the slower driver has a 2-hour head start, how long has she been on the road when two drivers are 683 miles apart?

D=RT
683=50T+65(T-2)
683=50T+65T-130
115T=683+130
115T=813
T=813/115
T=7.7 HOURS THE 50MPH CAR HAS BEEN ON THE ROAD WHEN THEY ARE 583 MILES APART.