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Mathematics · 2025 · 1 mark
CBSE 2025 · Region 7 · Set 3 · Q10
Edge of a variable cube increases at the rate of 5 cm / s. The rate at which the surface area of the cube increases when the edge is 2 cm long is:
Edge of a variable cube increases at the rate of $\displaystyle 5 \mathrm{~cm} / \mathrm{s}$. The rate at which the surface area of the cube increases when the edge is $\displaystyle 2$ cm long is :
Official answer
(B)
$\displaystyle 120 \mathrm{~cm}^{2} / \mathrm{s}$
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