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An air traffic controller spots two airplanes at the same altitude converging to a point as they fly at right angles to each other. One

An air traffic controller spots two airplanes at the same altitude converging to a point as they fly at right angles to each other. One airplane is150miles from the point and has a speed of300miles per hour. The other is200miles from the point and has a speed of400miles per hour.

(a) At what rate is the distance between the planes changing? in MPH

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