The length ' \( a \) ' of a rectangle is decreasing at the rate \( 8 \mathrm{~cm} / \mathrm{s} \....

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The length ' \( a \) ' of a rectangle is decreasing at the rate
\( \mathrm{P} \)
\( 8 \mathrm{~cm} / \mathrm{s} \) and the width ' \( b \) ' is increasing at the rate of \( 5 \mathrm{~cm} / \mathrm{s} \). The rate of change of area of rectangle when \( a=12 \mathrm{~cm} \) and \( b=9 \mathrm{~cm} \).
(1) \( 12 \mathrm{~cm}^{2} / \mathrm{s} \)
(2) \( -12 \mathrm{~cm}^{2} / \mathrm{s} \)
(3) \( 8 \mathrm{~cm}^{2} / \mathrm{s} \)
(4) \( -8 \mathrm{~cm}^{2} / \mathrm{s} \)


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