Question: Leaving from the same point P, airplane A flies due east while airplane B flies N 50 E. At a certain instant, A is 200

Leaving from the same point P, airplane A flies due east while airplane B flies N 50° E. At a certain instant, A is 200 miles from P flying at 450 miles per hour, and B is 150 miles from P flying at 400 miles per hour. How fast are they separating at that instant?

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