In the rectangular box with a square base below, assume that its width x is changing at the rate of 2 m/s, and that its main diagonal L is changing at the rate of 4 m/S. How fast is the height h of the rectangular box changing when the width x becomes 4 m and the main diagonal L becomes 6 m? Note that the main diagonal L is given by L2 = 2x2 + 112