If the volume of a cube is increasing at and the surface area of the cube is increasing at

, what is the length of each edge of the cube?

A. 2

B

C.

D. 4

E. 8

Answers are in inches.

This is what I know:

Dv/dt= 24

and DSA/dt= 12

SA= 3s...I think

So,

Dv/dt= 3s ds/dt

dSA/dt= 2 ds/dt

Ds/dt=

Now what?

Thanks!