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A plane traveling north at 120 knots passes directly over thePrescott airport. A second plane passes east over the airport onehour later, at a speed

A plane traveling north at 120 knots passes directly over thePrescott airport. A second plane passes east over the airport onehour later, at a speed of 100 knots. Both planes are at the samealtitude. After one more hour, how fast is the distance between theplanes changing?

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