You normally drive on the freeway between San Diego and Los Angeles at an average speed of 105 km/h (65 mi/h), and the trip takes 1 h and 50 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 (43 mi/h). How much longer does the trip take?

2 hr 45 min

Explanation:

Given

The average speed between San Diego and Los Angeles is

time taken for this trip is  

Distance between San Diego and Los Angeles is

For Friday afternoon, the average speed is  

time taken to complete the trip is

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