A jet airliner is cruising at a speed of 560 mi/h with its engines scooping in air at the rate of 720 lb/s and discharging it with a velocity of 1860 ft/s relative to the plane when a control surface malfunction suddenly causes a 20 percent increase in drag, knowing that the pilot maintains level flight with the same mass flow rate and discharge relative velocity, determine the new cruising speed. Assume that the drag due to air friction is proportional to the square of the speed of theplane.

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