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How to correctly describe the relationship between them in the variation of primary school mathematics?
Usually this kind of question is not so vague. But if you want to describe this kind of problem, you can use "the time spent is related to the distance" or "the longer the time spent, the longer the distance." The shorter the time, the shorter the journey. In the absence of a definition of an actual thing, it changes with what it is called, for example, X changes with Y, but if you define what X is and what Y is, you should consider grammar.