At the start of the day, a decorator rested a 3 m ladder against a vertical wall so that the foot of the ladder was 60 cm away from the base of the wall.
During the day, the ladder slipped down the wall, causing the foot of the ladder to move 80 cm further away from the base of the wall.
How far down the wall, in centimetres, did the ladder slip?
Give your answer to the nearest 1 cm.