Question: hello can i get some help with this problem A plane flying at an altitude of 3.0 mi is at a direct distance D=StartRoot 9.0

hello can i get some help with this problem

A plane flying at an altitude of 3.0 mi is at a direct distance D=StartRoot 9.0 + x2 EndRoot

from an airport controltower, where x is the horizontal distance to the tower. If theplane's speed is 370 mi/h, how fast is D changing when x=7.5 mi?

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