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When you normally drive the freeway between Sacramento and San Francisco at an average speed of...

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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Comment the longer time of the Friday trip was calculated

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