Kenneth ran a marathon (26.2 miles) in 5.5 hours. What was Kenneth’s average speed? (Round your answer to the nearest tenth.)

Average speed equals distance divided by time: 26.2 miles ÷ 5.5 hours ≈ 4.7636 miles per hour. Rounded to the nearest tenth, that is 4.8 mph, so the correct choice is 4.8 mph.

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