1. The problem statement, all variables and given/known data An airplane flies at an altitude of 8 miles toward a point directly over an observer (see figure). The speed of the plane is 600 miles per hour. Find the rates at which the angle of elevation θ is changing when the angle is θ = 30°, θ = 60°, and θ = 80°. 3. The attempt at a solution I tried solving this problem by my self but i kept getting stuck at one the same spot every time. (db/dt)=600 y=8 tanθ=8/x sec^2(θ) * dθ/dt = 8/x^2 * 600 and that's as far i get every time and i don't know if I'm doing it right or not.