Maria can build a model train in 7 hours. Anne can build a model train in 5 hours. how long would it take them if they work together?

How is this even a real question? None of this depends on stats or factual evidence, it is all based on if they feel good, they want to build a model train, or maybe if they have to eat dinner in between. I honestly don't know how you are going to get an answer to this question : / Tell whoever asks you the question that they need to reword it

2 and 11/12 is the answer i hope