hairimasu, kakarimasu, abimasu

Hi,

I'm a beginning student of Japanese, and trying to get straight the subtleties of words that translate the same way in English. I do Duolingo, and all three of the words in the post title are translated as "to take." "Kakarimasu" seems to be about time — e.g. "it takes ten minutes" — but the other two have me confused. They say "Shawaa o abimasu" (I take a shower) but "Ofuro o hairimasu" (I take a bath). Why the difference in the verb?

Sorry if this is a stupid question, I've just been at this for a few months and I like to know why things work as they do.

thanks,

Gordon