SOLUTION: A plane goes from A to B against the wind in 4 hrs and 30 minutes. It goes back again (WITH the wind) in 3 hrs and 40 minutes. It is 400 miles from A to B. How fast does the pla
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-> SOLUTION: A plane goes from A to B against the wind in 4 hrs and 30 minutes. It goes back again (WITH the wind) in 3 hrs and 40 minutes. It is 400 miles from A to B. How fast does the pla
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Question 97080: A plane goes from A to B against the wind in 4 hrs and 30 minutes. It goes back again (WITH the wind) in 3 hrs and 40 minutes. It is 400 miles from A to B. How fast does the plane fly in still air, and how fast is the wind? (Round to nearest hundredth.) Answer by checkley71(8403) (Show Source):
You can put this solution on YOUR website! DISTANCE=TIME*RATE
400=4.5*R
R=400/4.5
R=89 MPH AGAINST THE WIND.
400=3.667R
R=400/3.667
R=109 MPH WITH THE WIND.
(109-89)/2=20/2=10 MPH IS THE SPEED OF THE WIND.
THE SPEED OF THE PLANE IN STILL AIR IS:
109-10=99 OR
89+10=99
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