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Mathematics 12 Online
OpenStudy (anonymous):

Two planes at the same altitude are converging on a point as they fly at right angles to each other. One plane is 150 miles from the point moving at 450 mph. The other plane is 200 miles from the point moving at 600 mph. (a): At what rate is the distance between the planes decreasing? (b): How much time do the planes have before they collide? ...i would be very grateful for someone to explain their work...

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