SOLUTION: The rate of the jet stream is 100 miles per hour. Traveling with the jet stream, an airplane can fly 3600 miles in the same amount of time as it takes to fly 2400 miles against th

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Question 130558: The rate of the jet stream is 100 miles per hour. Traveling with the jet stream, an airplane can fly 3600 miles in the same amount of time as it takes to fly 2400 miles against the jet stream. What is the airplane's average rate in calm air?
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
3,600/(X+100)=2,400/(X-100) CROSS MULTIPLY.
2,400(X+100)=3,600(X-100)
2,400X+240,000=3,600X-360,000
1,200X-3,600X=-360,000-240,000
-1,200X=-600,000
X=-600,000/-1,200
X=500 MPH FOR THE JET IN STILL AIR.
PROOF:
3,600/600=2,400/400
6=6