Question: Oil spilled from a ruptured tanker spreads in a circle whose area increases at a constant rate of 9 mi ^ 2 / hr .

Oil spilled from a ruptured tanker spreads in a circle whose area increases at a constant rate of 9 mi^2/hr
. How rapidly is radius of the spill increasing when the area is 9 mi^2
?
The radius is increasing at
mi/hr.

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