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The top half of an hourglass is an inverted cone with an overall height of 15cm and radius of 9cm. Sand is falling into the

The top half of an hourglass is an inverted cone with an overall height of 15cm and radius of 9cm. Sand is falling into the bottom half at a rate of 10cm/sec. At what rate is the height of the sand decreasing when the sand is 7cm deep?

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