or
or
The paths of the planes create right triangle, with the distance between them equaling the hypotenuse of the triangle.
The distance of the first plane from the airport at 3:00 PM (2 hours after departure) is 2 x 150 = 300.
The distance of the second plane from the airport at 3:00 PM (2 hours after departure) is 2 x 200 = 400.
Thus, the distance between the two planes is 500, (since we have a 300 - 400 - 500 right triangle.)
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