SOLUTION: Question: If a plane can travel 500 miles per hour with the wind and 420 miles per hour against the wind, what is the speed of the plane in still air?

Question 718025: Question:
If a plane can travel 500 miles per hour with the wind and 420 miles per hour against the wind, what is the speed of the plane in still air?

Found 2 solutions by lwsshak3, Alan3354:
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
If a plane can travel 500 miles per hour with the wind and 420 miles per hour against the wind, what is the speed of the plane in still air?
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let x=speed of the plane in still air
let c=speed of the wind
..
x+c=500
x-c=420
2x=920
x=460
c=500-x=40
speed of the plane in still air=460 mph
speed of the wind=40 mph
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
If a plane can travel 500 miles per hour with the wind and 420 miles per hour against the wind, what is the speed of the plane in still air?
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It's the average of the 2, (500 + 420)/2 = 460 mi/hr
It's called airspeed.

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