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When flying with a tailwind of 10 miles per hour (mph), a given plane can fly 620 miles in a specified time.

When flying with a tailwind of 10 miles per hour (mph), a given plane can fly 620 miles in a specified time. The same plane can fly 540 miles when flying the same amount of time into a headwind of 20 mph. What is the speed of the plane if there is no headwind or tailwind?

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