railway RPF Constable Mock Test Series 2024 Quantitative Aptitude Time and Work Work Efficiency

Three persons X, Y and Z complete a work in 20 days. X alone can complete a work in 45 days and Y alone can complete a work in 60 days. How much time Z take to complete the work alone?

1
80 days
2
12 days
3
90 days
4
60 days
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