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"An aircraft with a constant speed in still air travels 4200 km with a constant tailwind in 3 hours."
I interpreted this as: "There is an aircraft that moves at a constant airspeed when there is no wind. In this instance, it travels 4200 km in 3 hours while it has a tailwind."
A tailwind will never be cancelled out by an equal headwind on the return trip because the duration of the flights is different. A flight with a tailwind will be shorter than with the headwind, and this changes the amount of time the wind has to effect the aircraft.
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