The daily output of a coal mine after t hours of operation is approximately 40t t 2 1 15t 3 tons, 0 t 12 Find the maximum rate of output (in tons of coal per hour) ...

The daily output of a coal mine after t hours of operation is approximately 40t + t

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The daily output of a coal mine after t hours of operation is approximately 40t + t² - 1/15t³ tons, 0 ≤ t ≤ 12. Find the maximum rate of output (in tons of coal per hour).

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