You are scheduling a new delivery route and you need to find out how long it will take a driver to complete the route. You start the route at 9:50 A. M. and finish at 2:05 P. M. How long does it take to drive the route?

The route will take four hours and fifteen minutes. If you start at 9:50 and count four hours, you'll get to 1:50, add ten to get to 2:00, then add 5 minutes to get to 2:05. Four hours plus ten minutes plus five minutes, 4:15.