An efficiency study of the first shift (from 8:00 A.M. to 5:00 P.M.) at a certain factory indicates that an average worker who arrives on the job at 8:00 A.M. will have assembled Q(t) = -2t3 + 8t2 + 10t MPEG Players t hours later. How many hours after the start of the shift is the worker performing most efficiently?

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