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A short - cut
If we can take two paths with different inclination angles and different length, do we know which one to choose? It depends on what we want to save: time or legs.
If you are in a hurry it's better to take velocity first on a steep slope and then quickly get to the goal. It takes much more time to gain the velocity on a straight road.
The shorter street does not always happen to be the quickest. Sometimes, when we hurry up for the train, it's worth taking the longest but steepest street.
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