SOLUTION: . Big plane. A six-passenger plane cruises at 180 mph in calm air. If the plane flies 7 miles with the wind I the same amount as it flies 5 miles against the wind, then what is th

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Question 58755: . Big plane. A six-passenger plane cruises at 180 mph in calm air. If the plane flies 7 miles with the wind I the same amount as it flies 5 miles against the wind, then what is the wind speed?
Answer by checkley71(8403) About Me  (Show Source):
You can put this solution on YOUR website!
7/(180+X)=5/(180-X)
5(180+X)=7(180-X)
900+5X=1260-7X
5X+7X=1260-900
12X=360
X=360/12
X=30 MPH IS THE WIND SPEED
PROOF
7/(180+30)=5/(180-30)
7/210=5/150
5*210=7*150
1050=1050