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A plane flying at an altitude of 2.0 mi is at a direct distance D = 1 4.0 + x from an airport control tower,
A plane flying at an altitude of 2.0 mi is at a direct distance D = 1 4.0 + x from an airport control tower, where x is the horizontal distance to the tower. If the plane's speed is 330 mi/h, how fast is D changing when x = 9.8 mi? D is changing at a rate of mi/h. (Do not round until the final answer. Then round to the nearest ten as needed.)
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