В смысле пришёл первым или первым участвовал?
Who was the first to take part in this/that marathon?

Переводы требуют комментариев.

Первым прОбежал и первым прИбежал - разные значения

Да, но спрашивающие бывают неточны в формулировках вопросов.

I think he was asking who won the marathon. but we don't know for sure

So many puzzles! I think if both meanings are possible, you should post them all.

Russ, it's more natural to ask "who was the winner of the marathon" or "who won the marathon"

+++Elena

done

👍🏼

Can I say it like " Who came in first in this marathon?"

Absolutely

thank you for your help🙂

Anytime