The density of air decreases with altitude roughly as 0 e z/H , where

The density of air decreases with altitude roughly as ρ ∼ ρ₀e^−z/H, where z is the height above the Earth’s surface and H ≅8.5 km near the surface. Compute the ratio of air resistance losses for an airplane traveling at 750 km/h at an altitude of 12000 m compared to an altitude of 2000 m. What happens to this ratio as the speed of the airplane changes? How do automobile air resistance losses at 2000 m compare to losses at sea level?