Teaching KVS Junior Secretariat Assistant (LDC) Mock Test 2022 Quantitative Aptitude Time and Work Work Efficiency
A can do a piece of work in 15 days, but with the help of B, he can do it in 9 days. In what time can B do it alone?
1
22.5 days
2
18 days
3
21 days
4
20.5 days