SOLUTION: Two planes leave St. Louis at the same time. One flies north at 350 mph and the other flies south at 420 mph. How far apart will they be in 2.5 hours?

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Question 356968: Two planes leave St. Louis at the same time. One flies north at 350 mph and the other flies south at 420 mph. How far apart will they be in 2.5 hours?
Answer by robertb(5830) About Me  (Show Source):