If the volume of a cube is increasing at the rate of 15 \( \mathrm{cm}^{3} / \mathrm{min} \). Wh....

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If the volume of a cube is increasing at the rate of 15
P
\( \mathrm{cm}^{3} / \mathrm{min} \). When its edge is \( 20 \mathrm{~cm} \), the surface area is
W
increasing at the rate of
(1) \( 2 \mathrm{~cm}^{2} / \mathrm{min} \)
(2) \( 3 \mathrm{~cm}^{2} / \mathrm{min} \)
(3) \( 4 \mathrm{~cm}^{2} / \mathrm{min} \)
(4) \( 5 \mathrm{~cm}^{2} / \mathrm{min} \)


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