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February 28, 2015

February 28, 2015

Posted by **zack** on Monday, April 4, 2011 at 9:26pm.

- math -
**Reiny**, Tuesday, April 5, 2011 at 12:33amSpeed of plane --- x mph

speed of wind ---- y mph

9(x-y) = 3600

x-y = 400

8(x+y) = 3600

x+y = 450

add them:

2x = 850

x = 425 , and y = 25

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