At a section in a passage, the pressure is \(30 \mathrm{psia}\), the temperature is \(100^{\circ} \mathrm{F}\), and the speed is \(1750 \mathrm{ft} / \mathrm{s}\). At a section downstream the Mach number is 2.5. Determine the pressure at this downstream location for isentropic flow of air. Sketch the passage shape.