Paul Picasso painted one-fourth of a house. His friend Monty Monet continued painting the house for eight hours and two-fifths of the house was done. What part of the house can Monty paint in an hour? Express your answer as a common fraction.
Monty must have painted 2/5 - 1/4 = (3/20) of the house
(3/20) / 8 = 3 /160 of the house in one hour