Cones and Water, LAWL.

Calculus Level pending

A cone shaped water tank starts off full. The radius of the cone is 5 cm and the height is 20 cm. If the water is flowing out of the vertex at a rate of 4 cm^3 per minute, then how fast is the depth of the water decreasing when the height is 2 cm?

Note: Put the answer in decimal form to the nearest tenth.

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