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Mathematics 69 Online
OpenStudy (anonymous):

An auto race consists of 8 laps. A driver completes the first 3 laps at an average speed of 185 miles/hour and the remaining laps at an average speed of 200 miles/hour. If d represents the length of one lap, which expression represents the time in hours, t, that it takes the driver to complete the race? The driver's average speed to complete all 8 laps is ______ miles per hour. Round to the nearest tenth of a mile per hour.

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