The length of a rectangle is increasing at a rate of 3 in/mi…

The length оf а rectаngle is increаsing at a rate оf 3 in/min and the area is increasing at a rate оf 8 in2/min.  At what rate is the width changing when the length is 12 in and the area is 120 in2? Credit will only be given if your work clearly shows and labels each of the following steps:    (a) Formula    (b) Derivative   (c) Solution  Type your answer in the field below and be sure to show your work on your paper.