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## Homework Statement

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°.

## 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.