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 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 the speed of the wind is 15 mph, find the speed of the plane in still air.