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Mathematics, 19.06.2021 21:00 scasemere

A plane flies 420 miles with the wind and 350 miles against the wind in the same length of time. If the speed of the wind is 15 ​mph, find the speed of the plane in still air.

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A plane flies 420 miles with the wind and 350 miles against the wind in the same length of time. If...
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