Posted by **Anna** on Sunday, November 4, 2012 at 6:00pm.

At a given moment, a plane passes directly above a radar station at an altitude of 7 miles.

(a) If the plane's speed is 400 mph, how fast is the distance between the plane and the station changing half an hour later?

(b) How fast is the distance between the plane and the station changing when the plane passes directly above the station?

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