I need help making a hide and seek as one of my minigames

I am currently make a minigames map and one of the minigames is hide and seek. I want to make the seeker be the seeker in a certain time. For example, I want when hide and seek is chosen I want the seeker to become the seeker at 15 seconds. I also want the location of the seeker pls help.

seeker location can probably be detected using player coordinates, and you can use trigger delays for the time.