SOLUTION: I am doing something wrong....I can not do this problem. WORD PROBLEM: SCIENCE AND MEDICINE. A plane flies 720 mi against a steady 30-mi/h headwind and then returns to the same

Question 46564: I am doing something wrong....I can not do this problem.
WORD PROBLEM: SCIENCE AND MEDICINE.
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 plane's speed in still air?
Answer by checkley71(8403) (Show Source): You can put this solution on YOUR website!
720/(X+30)+720/(X-30)=10 OR (720X-21600+720X+21600)/(X~2-900)=10 OR
10X~2-9000=1440X OR 10X~2-1440X-9000 OR X~2-144X-900 OR (X-150)(X+6)=0 OR
X=150 & X=-6 THUS THE SPEED OF THE AIRCRAFT IS 150
PROOF 720/(150-30)+720/(150+30)=10 OR 720/120+721/180=10 OR 6+4=10 OR 10=10
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