The width of a rectangle remains fixed at while its length increases at

MATHEMATICS · Subjective · CBSE · Mathematics · Applications of Derivatives · Applications of Derivatives

Problem

The width of a rectangle remains fixed at

5\,\text{cm}

while its length increases at

3\,\text{cm\,/s}

. Explain briefly, without detailed calculation, why the perimeter increases at

6\,\text{cm\,/s}