A painter and her two helpers each paint at constant, but different, rates. They always start at AM, and all three always take the same amount of time to eat lunch. On Monday the three of them painted of a house, quitting at PM. On Tuesday, when the painter wasn't there, the two helpers painted only of the house and quit at PM. On Wednesday the painter worked by herself and finished the house by working until PM. How long, in minutes, was each day's lunch break?
30
36
42
45
50
