1. The problem statement, all variables and given/known data A winch at the top of a 15 meter tall building pulls a pipe of length 15 meters. The winch pulls the rope in at the rate of -0.3 m/s. Find the rate of vertical change and the rate of horizontal change at the upper end of the pipe when y = 6 meters. 2. Relevant equations x^2 + y^2 = s^2 x dx/dt + y dy/dt = s ds/dt 3. The attempt at a solution The question is what is dx/dt and what is dy/dt. So I need two equations to relate the two. I have about two pages full in my notebook, it's probably better that I not share them?