SOLUTION: With a tailwind, a plane can fly 450 miles in 3 hours. The return trip takes 5 hours Find the speed of ther plane in still air and the speed of the wind.
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Question 26709: With a tailwind, a plane can fly 450 miles in 3 hours. The return trip takes 5 hours Find the speed of ther plane in still air and the speed of the wind. Answer by Paul(988) (Show Source):
You can put this solution on YOUR website! Let the speed of the plane be x
Let the speed of the wind be y
3(x+y)=450---------->3x+3y=450
Solve for y
3y=450-3x
y=150-x (subsituion)
Second equation:
5(x-y)=450 ----->5x-5y=450 (use subsitution)
5x-5(150-x)=450
5x+5x-750=450
10x=1200
x=120
3(120)+3y=450
360+3y=450
3y=90
y=30
Hence, the speed of the plane is 120mph and the speed of the wind is 30mph.
Paul.
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