SOLUTION: Two planes leave San Francisco headed for Dallas at the same time. Plane 1, Commercial Jet, takes 3 hours to arrive in Dallas. Plane 2, Private Jet, takes 3 1/2 hours to arri

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Question 115253: Two planes leave San Francisco headed for Dallas at the same time.
Plane 1, Commercial Jet, takes 3 hours to arrive in Dallas.
Plane 2, Private Jet, takes 3 1/2 hours to arrive in Dallas.
In how many hours will Plane 2 be twice the distance from
Dallas as the first plane?
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
fraction of trip remaining equals ((total time)-(elapsed time))/(total time)

(3.5-t)/3.5=2((3-t)/3) ___ 3(3.5-t)=3.5*2(3-t) ___ 10.5-3t=21-7t ___ 4t=10.5