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by the way, you are correct when you say that the tailwind and headwind cancel each other out **when you consider the round trip flight as a whole**. In other words, it takes 7 hours to get from here to there, and the head and tail winds cancel each other out. therefore, you travel 8400 kilometers in 7 hours, and you divide 8400 by 7 to get the velocity of the plane.
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oh baby oh baby, i like gravy.
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