Car a leaves a gas station traveling 30 miles per hourtwo ho

Car a leaves a gas station traveling 30 miles per hour.two hours later car b leaves the same gas station traveling 50 miles per hour in the oppisite direction.How long will it take for the cars to be 380 miles apart?

Solution

Car A has 60 mi lead
they are moving apart at 80 mph
(380-60)/80=4 hrs