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A container in the shape of an inverted ...

A container in the shape of an inverted cone has height 12 cm and radius 6cm at the top. If it is filled with water at the rate of `12cm^(3)//sec`, what is the rate of change in the rate of change in the height of water level when the tank is filled 8 cm?

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The correct Answer is:
`(3)/(4pi)" cm/sec"`.
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