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On a sunny morning a high-speed train from the RENFE company departed from the Zaragoza station bound for Barcelona.
Who will travel faster, the train or its shadow?
In principle the speed of the train is the same as that of its shadow, but if we take into account that the shadow of a static object moves from West to East we must assume that the shadow of the train will travel slower when the train moves west but faster when the train travels east. Since Barcelona is located east of Zaragoza the shadow travels faster than the train.