When you normally drive the freeway between Sacramento and San Francisco at an average speed of 115 km/h (71.5 mi/h), the trip takes 1 h and 13 min. On a Friday afternoon, however, heavy traffic slows you down to an average of 105 km/h (65.2 mi/h) for the same distance. How much longer does the trip take on Friday than on the other days?
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