Mathematics, 08.12.2020 19:50 raiindrxp

A plane traveling from Phoenix to Washington, D. C with a tailwind of 20 miles per hour takes 3 hours. The return trip in the same wind, which is now a headwind, takes the same plane 3 hours and 12 minutes. What is the average speed of the plane in calm conditions? 700 miles/hour
600 miles/hour
650 miles/hour
620 miles/hour

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