SOLUTION: An airplane flew for 4 hours with a 20 km/h tail wind. The return flight against the same wind took 5 hours. Find the speed of the plane in still air.
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Question 32610: An airplane flew for 4 hours with a 20 km/h tail wind. The return flight against the same wind took 5 hours. Find the speed of the plane in still air. Answer by Paul(988) (Show Source):
You can put this solution on YOUR website! lET THE SPEED OF THE PLANE BE X
Equation:
4(x+20)=5(x-20)
4x+80=5x-100
-x=-180
x=180
Hence, the speed of the plane is 180mph.
Paul.
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