At what point did we indicate/learn that “to” only indicates a relationship involving forward movement? That is not how that word or phrase is used in everyday context. If, in the moment, two people are running a race and one person is 5 yards behind someone and another person is 20 yards in front of them and you ask who is the person closest to you’d probably say the person behind them (and indicate he is behind) even though the race is moving forward in the other direction.
Now if the context of this is that time moves foarward and can’t move backwards, then yes I can see why the answer would be 11:55am, but we’d need to know the context of the question/lesson… otherwise, its a trick question and the type of question that shouldn’t be on a test. At best, it should be on an informational test to see how a student thinks.