SOLUTION: an airplane flew for 5 hr with a 20-km/h tailwind and returned in 7 hr against the same wind. find the speed of the plane in still air.
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Question 460600: an airplane flew for 5 hr with a 20-km/h tailwind and returned in 7 hr against the same wind. find the speed of the plane in still air.
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
5*(x+20)=7*(x-20)
5x+100=7x-140
240=2x
120=x
120 mph in still air
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