Peter can drive to work via the expressway or via the city roads, which is a less delay-prone route to work. What is the difference in the time Peter would spend driving to work via the expressway versus the city roads?
(1) Peter always drives 60mph, regardless of which route he takes; it takes Peter an hour to drive round-trip to and from work using the city roads
(2) If Peter travels to and from work on the expressway, he spends a total of 2/3 of an hour traveling