SOLUTION: An airplane can fly with the wind a distance of 700 miles in 5 hours. However, the return trip against the wind takes 7 hours. Find the speed of the plane in still air and the spee

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Question 906210: An airplane can fly with the wind a distance of 700 miles in 5 hours. However, the return trip against the wind takes 7 hours. Find the speed of the plane in still air and the speed of the wind.
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
(r+w)*5=700
r+w=140
r-w=100
2r=240
r=120
(r-w)*7=700
120-w=100
w=20

check
(120+20)*5=700
140*5=700
700=700
(120-20)*7=700
100*7=700
700=700
ok