Posted by **Anonymous** on Wednesday, February 16, 2011 at 3:03pm.

It took a small plan 1 hour longer to fly 480 miles against the wind than it took the plane to fly the same distance with the wind. If the wind speed was 20 mph, then what is the speed of the plane in calm air?

- math -
**Evelyn**, Wednesday, February 6, 2013 at 3:56pm
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