Carolyn leaves at 2:15 and drives 40 miles per hour. Marcel leaves at 2:45 and drives at 65 miles per hour. If they are traveling the same route, at what time will Marcel pull ahead of Carolyn?
Marcel leaves 30 minutes after Carolyn, leaving between them a gap of 40mph*0.5h=20miles To catch up with the 20miles, Marcel uses the extra (65-40=25)mph that he has. Therefore 20m/25mph=0.8h=0.8*60min=48minutes after 2:45, which is at 3:33, Marcel catches up to Carolyn.
