Question 25
It takes Nicolai one and a half hours to paint the walls of a room and two hours to paint the ceiling. Elena needs exactly one hour to paint the walls of the same room and one hour to paint the ceiling.
If Nicolai and Elena work together, what is the shortest possible time in minutes in which they can paint the walls and the ceiling of the room?
If Nicolai and Elena work together, what is the shortest possible time in minutes in which they can paint the walls and the ceiling of the room?