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The graph below shows Aaron’s distance from home at times throughout his morning run. Assume that his route lies along a straight line. Which of the following statements is true?

A Aaron’s average speed was 6 mph.

Notice that the -axis does not show total distance traveled but rather Aaron’s displacement from home. Aaron ran four miles out from home and then back home again, so he ran a total of eight miles. Completing the run in 80 minutes gives him an average speed of: