1. The problem statement, all variables and given/known data A rectangle has a constant area of 200m2 and its length L is increasing at the rate of 4 meters per second. Find the width W at the instant the width is decreasing at the rate of 0.5 meters per second. 2. Relevant equations [tex]A=200[/tex] [tex]dA/dt =0[/tex] (since the area is constant) [tex]dL/dt =4 m/s[/tex] [tex]dW/dt =-0.5 m/s[/tex] [tex]A=(L)(W)[/tex] and I'm not sure, but parameter is [tex]P=2L+2W[/tex] 3. The attempt at a solution I wrote L in terms of W, and W in terms of L, but I am having trouble taking L=(200/W) to dL/dt. I know that most related rates problems need two equations, so I have been trying to figure out how parameters may work in. Any help is greatly appreciated.