joey drives from smallville to largeville at an average speed of 72 mph. once he arrives at largeville, he immediately turns around and heads back to...

joey drives from smallville to largeville at an average speed of 72 mph. once he arrives at largeville, he immediately turns around and heads back to smallville. on the trip back to smallville from largeville, he has car trouble and drives an average speed of 48 mph. if the total round trip takes joey 5 hours, what is the distance between smallville and largeville?