Mathematics, 24.07.2019 18:00 bestdiva2

Aplane traveling from phoenix to san francisco with a tailwind of 35 miles per hour takes 2.5 hours. returning with the headwind it takes the same plane 2 hours and 45 minutes. what is the average speed of the plane in calm conditions?

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Aplane traveling from phoenix to san francisco with a tailwind of 35 miles per hour takes 2.5 hours....

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