Posted by **Meghan** on Wednesday, March 24, 2010 at 8:59am.

A plane can fly 140 mph in calm air. Flying with the wind, the plane can fly 700 mi in the same amount of time it takes to fly 420 mi against the wind. Whats the rate of the wind?

- Math -
**drwls**, Wednesday, March 24, 2010 at 9:15am
Let V be the wind speed. The flight time is D/(140+V)with a tail wind and

D/(140-V) with a head wind.

Solve 700/(140+V) = 400/(140-V)

98,000 -700V = 56,000 +400V

1100V = 42,000

V = 38.2 km/h

- Math -
**Meghan**, Wednesday, March 24, 2010 at 9:37am
Thanks

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