Question

An inverted conical tank with a diameter of 40 cm and a height of 60 cm has been filled with water. However, due

to a hole at the tip of the cone, the water is leaking out of the tank at a rate

of 0.2 liters per minute. How fast is the water level changing when there are 8/pie^2 liters of water

in the tank?

(One liter equals 1000 cm^3.)

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