Question: I keep getting the incorrect answer for this problem. Not sure what I am doing wrong. A conical water tank with vertex down has a

I keep getting the incorrect answer for this problem. Not sure what I am doing wrong.

A conical water tank with vertex down has a radius of 11 feet at the top and is 30 feet high. If water flows into the tank at a rate of 20 ft^3/min, how fast is the depth of the water increasing when the water is 18 feet deep?

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