At an open-cut coal mine, a machine removes \( V\) cubic metres of coal in t hours, where \(V = 10t – \dfrac{{{t^2}}}{{10}}\). At what time is the machine removing coal at the rate of 9 m^{3} per hour?

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Question 6 of 10

6. Question

Find the maximum and minimum values of \(P = 400 + 100\sin \dfrac{{\pi t}}{3}\).