How long is a 13k marithon?

Answer 1

I think you are a little confused.

If a race is 13k then the distance is 13 kilometres, obviously.

There is no such thing as a 13k marathon.

A marathon is 26.2 miles, or 42.2km - with a half-marathon being half that distance, obviously.

So, there is a chance that your 13km marathon refers to the 13.1 miles that are in a half-marathon.

Hope that helps.