Round trip winds

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Each day, a plane flies due east from airport A to airport B, then back (due west) from airport B to airport A. The plane always flies with the same constant engine speed. On Monday, there was no wind at all, and the complete round trip took 4 hours. On Tuesday, there was a strong wind blowing from the east at a constant velocity all day. Did Tuesday's trip take more, less, or the same amount of time as Monday's trip?

See also