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8. A driver averages 60 mph (miles per hour) over the rst three hours of a trip and 55 mph for the next four hours.

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8. A driver averages 60 mph (miles per hour) over the rst three hours of a trip and 55 mph for the next four hours. If the driver then sets the cruise control to 50 mph, how many additional hours are needed for the average speed of the entire trip to decrease to 54 mph

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