Assume that an airplane is flying toward you at a constant height h = 1 mile and at a speed dxdt=−20 miles/hr. When the plane is 2 miles away, what is the rate of change of θ?

tan(θ)=h/x

A. dθ/dt=−6 degrees/second

B. dθ/dt=−4 degrees/second

C. dθ/dt=4 degrees/second

D. dθ/dt=6 degrees/second