An airliner is cruising at an altitude of \(5.5 \mathrm{~km}\) with a speed of \(700 \mathrm{~km} / \mathrm{hr}\). As the airliner increases its altitude, it adjusts its speed so that the Mach number remains constant. Provide a sketch of speed vs. altitude. What is the speed of the airliner at an altitude of \(8 \mathrm{~km}\) ?