other govt exam India Post Postman & Mail Guard Mock Test 2020 Quantitative Aptitude Time and Work Work Efficiency
A can do a piece of work in 18 days and B in 12 days. They began the work together, but B left the work 3 days before its completion. In how many days, in all, was the work completed?
1
12
2
10
3
9.6
4
9