A plane flying at an altitude of 20 km is at a diroct distance D-4.0+ x from an girport control tower, where x s the horizontul distance to the lower f Uho plare's speed is 320 km/h, how fast is D changing when x98 kr D s changing at a rate of km/h (Do not round unti the final answor Then round to the nearest ten as heeded.)

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