Question: A funnel is shaped like an inverted (point-down) cone, whose radius is equal to its height. At first, the funnel is empty. Oil is poured
A funnel is shaped like an inverted (point-down) cone, whose radius is equal to its height. At first, the funnel is empty. Oil is poured into the funnel at a rate of 200cm3/sec, and flows out the bottom at 20cm3/sec. How fast is the depth of the oil in the funnel changing when the oil is 15cm deep? Express your answer as an exact value.
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