$\"\"$

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The volume of the cone $\"\"$ .

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The Conical tank is $\"\"$ feet across the top then $\"\"$ and $\"\"$ feet deep then $\"\"$ .

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Find $\"\"$ .

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$\"\"$

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$\"\"$

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Substitue $\"\"$ in teh equation $\"\"$ .

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$\"\"$

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$\"\"$

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Apply derivative on each side with respect to $\"\"$ .

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$\"\"$

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Power rule of the derivative: $\"\"$ .

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$\"\"$ .

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$\"\"$

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Find $\"\"$ when depth of the water is $\"\"$ feet deep.

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Substitute $\"\"$ and $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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The rate of change of water deep $\"\"$ .

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$\"\"$

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$\"\"$ .