When you normally drive the freeway between Sacramento and San Francisco at an average speed of 100 km/hr (62.1 mph ), the trip takes 1.00 hr and 24.0 min. On a Friday afternoon, however, heavy traffic slows you down to an average of 65.0 km/hr (40.4 mph ) for the same distance.
How much longer does the trip take on Friday than on the other days?
How much longer does the trip take on Friday than on the other days?