Teaching OSSC TGT Teachers Mock Test 2023 Quantitative Aptitude Time and Work Work Efficiency

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?

1
60
2
90
3
45
4
120
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