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An open Can of oil is accidently drop...

An open Can of oil is accidently dropped into a lake; assume the oil spreads over the surface as a circular disc of uniform thickness whose radius increases steadily at the rate of 10 `c m//s e c` . At the moment when the radius is 1 meter, the thickness of the oil slick is decreasing at the rate of `4\ m m//s e c` , how fast is it decreasing when the radius is 2 meters.

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