The length of a rectangle is increasing at a rate of 5 in/mi…

The length of a rectangle is increasing at a rate of 5 in/min and the area is increasing at a rate of 12 in2/min.  At what rate is the width changing when the length is 10 in and the area is 140 in2? Credit will only be given if your work clearly shows your formula, its derivative, and shows all the work used in the steps to solve the problem. Type your answer in the field below and be sure to show your work on your paper.