X alone can do a piece of work in 15 days. Y alone can do the same wor – McqOptions

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1.	X alone can do a piece of work in 15 days. Y alone can do the same work in 30 days. X, Y and Z, working together, can complete the work in nine days. In how many days Z alone can complete the same work?
A.	60
B.	90
C.	45
D.	120
Answer» C. 45

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