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An airplane flew with the wind for 2.5 hours and returned the same distance against the wind in 3.5 hours.

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An airplane flew with the wind for 2.5 hours and returned the same distance against the wind in 3.5 hours. If the cruising speed of the plane was a constant 360 mph in air, how fast was the wind blowing? (Hint: If the wind speed is r miles per hour, then the plane travels at (360 + r) mph with the wind and at (360 - r)mph against the wind)

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