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A strip of $120$ mm width and $8$ mm thickness is rolled between two $300$ mm-diameter rolls to get a strip of $120$ mm width and $7.2$ mm thickness. The speed of the strip at the exit is $30$ m/min. There is no front or back tension. Assuming uniform roll pressure of $200$ MPa in the roll bite and $100\%$ mechanical efficiency, the minimum total power (in $kW$) required to drive the two rolls is _______.
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