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Calculate the ratio of the drag force on a passenger jet flying with a speed of 1100 km/h at an altitude of 10 km to the drag force on a prop-driven transport flying at two-thirds the speed and half the altitude of the jet. At 10 km the density of air is 0.38 kg/m3 and at 5.0 km it is 0.67 kg/m3. Assume that the airplanes have the same effective cross-sectional area and the same drag coefficient C.

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