defence exam CRPF Head Constable Ministerial & ASI 2022 Mock Test Quantitative Aptitude Time and Work Work Efficiency
L and M can do a piece of work in 10 and 15 days respectively. L, M and N together can do the same work in 5 days. In how many days N can alone do the work?
1
18 days
2
20 days
3
30 days
4
25 days