You normally drive on the freeway between San Diego and Los Angeles at an average speed

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You normally drive on the freeway between San Diego and Los Angeles at an average speed of 105 km/h 165 mi/h^2, and the trip takes 2 h and 20 min. On a Friday afternoon, however, heavy traffic slows you down and you drive the same distance at an average speed of only 70 km/h 143 mi/h^2. How much longer does the trip take?

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