SOLUTION: An airplane (L) leaves Los Angeles for Denver at a speed of 420mph. Thirty minutes later, a plane (D) going from Denver to Los Angeles leaves Denver, which is 850 miles from Los An

Question 850149: An airplane (L) leaves Los Angeles for Denver at a speed of 420mph. Thirty minutes later, a plane (D) going from Denver to Los Angeles leaves Denver, which is 850 miles from Los Angeles, at a speed of 530 mph. When they meet, how far are they from Denver?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
In those 30 minutes the first plane from LA has already gone 210 miles
850-210=640
(420+530)x=640
They meet after x = 0.67368 hours
D= 530*0.67368=357.05 from Denver
L=210+420*.67368
L=850-(210+282.9456)=357.05 from Denver

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