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The surface area of a sphere of radius r is A = 4r. If the surface area is increasing at a rate of 15

The surface area of a sphere of radius r is A = 4r. If the surface area is increasing at a rate of 15 cm/s, how fast in the diameter increasing when the diameter is 3 cm? Express your answer as a decimal, rounded to 2 decimal places if necessary. Be sure to include proper units!

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