state gov Rajasthan Gram Vikas Adhikari (VDO) Mock Test 2021 Quantitative Aptitude Time and Work Work Efficiency
A and B can do a piece of work in 12 days, B and C in 15 days and C and A in 20 days. In how many days will the three of them together complete the same work?
1
20 days
2
10 days
3
21 days
4
30 days