engineering recuitment Vizag Steel MT Mechanical 2020 Test Series Quantitative Aptitude Time and Work Pipe and Cistern
X alone can do a work in 10 days. Y alone can do the same in 15 days. X, Y and Z together can do the same work in 3 days. In how many days can Z alone do the work?
1
6
2
9
3
4
4
10