How to find the equivalence relation of one-dimensional linear equation in grade one

Let me give you an example: when a person goes from A to B, his speed is 100m/h, and A to B is 5000m long. How long did it take him?

Like this question, you can piece together all the known figures and see what they have to do with each other.

The relationship like this is: his speed is 100m/h* the time he spent = the total length is 5000m.

Then the unknown part of this problem is that there is no condition (the time he uses), so the time is set to X.

By the way, pay attention to their relationship and don't add useless conditions. For example, if a book has 100 pages, don't include its price.

Tell me what you said in detail and I'll explain it to you.