An airplane flies from New York to San Francisco, a distance of 2,700 miles, at constant airspeed in 6 ½ hours. The return flight, at the same airspeed, takes 6 hours. Determine the speed of the wind, assuming it to be constant.

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An airplane flies from New York to San Francisco, a distance of 2,700 miles, at constant airspeed in 6 ½ hours. The return flight, at the same airspeed, takes 6 hours. Determine the speed of the wind, assuming it to be constant.