SOLUTION: A plane traveled 480 miles to Lisbon and back. the trip was with wind. it took 4 hours. the trip back was into the air. the trip back took 8 hours. find the speed of the plane in s

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Question 414654: A plane traveled 480 miles to Lisbon and back. the trip was with wind. it took 4 hours. the trip back was into the air. the trip back took 8 hours. find the speed of the plane in still air and the speed of the wind.
so far..i divided 480/4 = 120 (wind) and i divided 480/8 = 60 (air)
but i don't know how to set the equation up.
if you could that would be great! :)
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

A plane traveled 480 miles to Lisbon and back. the trip was with wind. it took 4 hours. 

the trip back was into the air. the trip back took 8 hours.

s + w = 120mph     |480mi/4hr = 120mph    Good Work.

s - w =  60mph       |480mi/8hr = 60mph     Good Work.

 2s = 180mph

  s = 90mph

  w = 30mph   ( w = 120mph-90 ) from 1st Eq