# Popeye Needs His Spinach

Calculus Level 2

Popeye loves his spinach. Popeye squeezes a can of his favorite spinach in such a way that it retains the shape of a cylinder and its volume remains constant, but the radius of the can decreases at $$1 \text{ cm}$$ per second. How fast is the height of the can changing at the moment the can has a radius of $$4 \text{ cm}$$ and a height of $$10 \text{ cm}?$$

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