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Constant or not, you can't break the equation down into:
dist = time1 * (plane speed + wind speed)
dist = time2 * (plane speed - wind speed)
Although the drag force will be stronger on the return trip, it won't "slow the plane down" by 175 km/hr and on the first flight you won't get a 175 km/hr boost from the wind. Unless of course we have wind speeds approaching the speed of sound...
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