Calculus Problem?? Suppose that we have a ladder 20feet long, leaning against a wall. Let x be the distance from the wall to the bottom of the ladder and y be the distance from the ground to the top of the ladder. a. What will be the value of dy/dt when the top of the ladder hits the ground? What is going on here? So far I found the value of dy/dt to be negative infinity, but i cannot figure out what is actually going on here. Does someone have an idea?? Thanks in advance.