If he mops 1/3 of the room in 5 minutes then he is mopping at a rate of 1 room every 15 minutes.
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To find the rate at which the janitor is mopping, we can divide the fraction of the classroom mopped by the time taken. So, 1/3 of the classroom mopped in 5 minutes would be (1/3) / 5 = 1/15 of the classroom mopped per minute. Therefore, the janitor is mopping at a rate of 1/15 of the classroom per minute.
Oh, dude, this janitor is on a roll! He's mopping at a rate of 1/15 of the classroom per minute. So, like, he'd finish mopping the whole place in 15 minutes. Easy peasy lemon squeezy.