I don’t see the issue in letting everyone run the same 10 km at the same time. A man will probably finish first, so what? Equality is not about being the same, it’s about being equal. You can easily have separate results for men and women. In fact, that’s pretty standard for these kinds of amateur races in my experience. You can also have multiple start times based on self reported running speeds. Also pretty common and avoids slow people being in the way of fast people.
I don’t see the issue in letting everyone run the same 10 km at the same time. A man will probably finish first, so what? Equality is not about being the same, it’s about being equal. You can easily have separate results for men and women. In fact, that’s pretty standard for these kinds of amateur races in my experience. You can also have multiple start times based on self reported running speeds. Also pretty common and avoids slow people being in the way of fast people.