Question 414654
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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