Question

A rectangle initially has width 66 meters and length 55 meters and is expanding so that the area increases at a rate of 88 square meters per hour. If the width increases by 2020 centimeters per hour, how quickly does the length increase initially?Hint: Using the product rule, if you know any two of the derivatives you can work out the third one. Here you know ?=?×?A=L×W, ?′A′, and ?′W′.

Answer 1