Posted by Amber on Monday, November 16, 2009 at 8:19am.
Let t be the time after the first jet leaves for LA, and x be the location of a plane, measured from LA.
2100 - x = 500 t
x = 700 (t -1) = 700 t - 700
Substitute 2100 - 500 t for x in the second equation and solve for t.
2100 - 500 t = 700 t - 700
2800 = 1200 t
t = 7/3 hours = 2 hours & 20 minutes
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