SOLUTION: A plane flies 465 miles with the wind and 345 miles against the wind in the same length of time. If the speed of the wind is 20mph, find the speed of the plane in still air.
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Question 758715: A plane flies 465 miles with the wind and 345 miles against the wind in the same length of time. If the speed of the wind is 20mph, find the speed of the plane in still air. Answer by lwsshak3(11628) (Show Source):
You can put this solution on YOUR website! A plane flies 465 miles with the wind and 345 miles against the wind in the same length of time. If the speed of the wind is 20mph, find the speed of the plane in still air.
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let x=speed of plane in still air
let c=speed of wind
x+20=speed of plane with the wind
x-20=speed of plane against the wind
travel time=distance/speed
..
465(x-20)=345(x+20)
465x-9300=345x+6900
120x=16200
x=135
speed of the plane in still air=135 mph
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