engineering recuitment DRDO CEPTAM STA B Tier I (Sr. Technical Assistant) Mock Test 2022 Quantitative Aptitude Time and Work Work Efficiency
A and B can finish a work in 9 days, B and C can finish it in 12 days and A and C can finish it in 18 days. In how many days can A, B and C finish the work together?
1
9
2
7
3
8
4
6