A camera mounted 132ft above the ground is videotaping a racecar moving at 264ft/sec. How fast will the camera angle be changing when the car is right in front of you? a half second later?

">" is the angle

tan>=y/x and dtan>/dt= x(dy/dt)-y(dx/dt)/x^2

y=132ft and dx/dt=264ft/sec

How do I find x. or where do I go from here