Question 13
Paula the painter and her two helpers each paint at constant, but different, rates. They always start at $8{:}00$ AM and all three always take the same amount of time to eat lunch. On Monday the three of them painted $50\%$ of a house, quitting at $4{:}00$ PM. On Tuesday, when Paula wasn’t there, the two helpers painted only $24\%$ of the house and quit at $2{:}12$ PM. On Wednesday Paula worked by herself and finished the house by working until $7{:}12$ PM. How long, in minutes, was each day’s lunch break?