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Posted by **Anonymous** on Tuesday, December 14, 2010 at 8:09pm.

descending at the rate of 120 ft per minute.

How long will it take the 2 planes to be at the same altitude?

- Math -
**MathMate**, Tuesday, December 14, 2010 at 9:51pmEquate their altitudes in feet and solve for t (in minutes):

520+40t = 3800 - 120t

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