Mathematics

Problem

The length of a rectangle increases at

2\,\text{cm/s}

while its width decreases at

1\,\text{cm/s}

. What is the rate of change of its perimeter when the length is

10\,\text{cm}

and the width is

6\,\text{cm}

? a)

6\,\text{cm/s}

2\,\text{cm/s}

3\,\text{cm/s}

-2\,\text{cm/s}