SOLUTION: If a plane can travel 470 miles per hour with the wind and 430 miles per hour against the wind, find the speed of the plane in still air. What is the speed of the plane in still

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: If a plane can travel 470 miles per hour with the wind and 430 miles per hour against the wind, find the speed of the plane in still air. What is the speed of the plane in still      Log On


   

Question 373590: If a plane can travel 470 miles per hour with the wind and 430 miles per hour against the wind, find the speed of the plane in still air.
What is the speed of the plane in still air?
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi,

Let x represent the speed of the plane in still air & y the speed of the wind

Question states

x + y = 470mph

x - y = 430mph

Adding the equations together

2x = 900mph

x = 450mph, the speed of the plane in still air