Mark the muralist and his two assistants 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 large mural, quitting at PM. On Tuesday, when Mark wasn't there, the two assistants painted of the mural and quit at PM. On Wednesday Mark worked by himself and finished the mural by working until PM. How long, in minutes, was each day's lunch break?
45
50
55
60
65
