SOLUTION: A plane makes a trip 5040 km in 7 h, flying with the wind. Returning against the wind , the plane makes the trip in 9 h. What is the speed of the wind?

Question 326185: A plane makes a trip 5040 km in 7 h, flying with the wind. Returning against the wind , the plane makes the trip in 9 h. What is the speed of the wind?
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Let P be the plane speed in still air, W the wind speed.

1.
.
.
.

2.
Add eq. 1 to eq. 2 to eeliminate W.

kph
Then use either equation to solve for W,

kph
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