A 20 meter ladder is leaning against a wall. The distance x of t between the bottom of the ladder and the wall is increasing at a rate of three meters per minute. At a certain instant, t sub zero, the top of the ladder is a distance y of t sub zero of 15 meters from the ground. What is the rate of change of the angle, theta of t between the ground and the ladder at that instant? What I'm gonna do is draw this out, and really the first step is to think about, well, what equation will be helpful for us to solve this problem? Then we might just go ahead and actually solve the problem. A 20 meter ladder is leaning against a wall.