MP Police Constable 20-Aug-2017 Shift 1 Solved Paper

X takes 4 days to complete one-third of a piece of work; Y takes 3 days to complete one-sixth of the same work, and Z takes 5 days to complete half of the work. If all the three work together for 3 days and X and Z quit, how long will it take for Y to complete the remaining task alone?