SOLUTION: Two plane leave NAIA airport at the same time. One travels north at 680mph and the other travels south at 620mph. How long will it take for the two planes to be 3900miles apart?

Question 834183: Two plane leave NAIA airport at the same time. One travels north at 680mph and the other travels south at 620mph. How long will it take for the two planes to be 3900miles apart?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
Two plane leave NAIA airport at the same time.
One travels north at 680mph and the other travels south at 620mph.
How long will it take for the two planes to be 3900miles apart?
:
Let t = time for this to be accomplished
:
Write a dist equation; dist = speed * time
680t + 620t = 3900
find t
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