A freight train leaves a station and travels north at 40 mph. Four hours later, a passenger train leaves on a parallel track and travels north at 80 mph. How long will it take the passenger train to o

A freight train leaves a station and travels north at 40 mph. Four hours later, a passenger train leaves on a parallel track and travels north at 80 mph. How long will it take the passenger train to overtake the freight​ train? How far from the station will they​ meet?