Answer:
2 hours
Explanation:
Divide both sides by 2/5 so you can see that it takes 2/5 of an hour to paint 1/5 of a room. Then you multiply both sides by 5 to get the whole room (5/5 is equal to a whole) which would get you 10/5 which is equal to 2. It takes 2 hours to paint one room.