SOLUTION: a plane flies 720 mi against a steady 30 mi/h headwind and then returns to the same point with the wind. if the entire trip takes 10 h what is the planes speed in still air?
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Question 26927: a plane flies 720 mi against a steady 30 mi/h headwind and then returns to the same point with the wind. if the entire trip takes 10 h what is the planes speed in still air?
Answer by Paul(988) (Show Source): You can put this solution on YOUR website!
720[(x+30)+(x-30)]=10[(x+30)(x-30)]
Factor:
(x+6) and (x-150)
Remove the negative x=150
Hence, the speed of the plane in still ari is 150mph.
Paul.
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