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The volume V between the two concentric spheres is growing

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The volume V between the two concentric spheres is growing. While the radius of the outer sphere increases with a speed of 2 m / s, the radius of the inner sphere decreases with a speed of 1/2 m / s. So when the radius of the outer sphere is 3m and the radius of the inner sphere is 1m, what is the rate of change of the volume V?