GAT Subject
Engineering
Computer Science Civil Engineering Chemical Engineering Agricultural Engineering Mechanical Engineering Electronics and Communication
5. | A and B can do a piece of work in 12 days; B and C in 15 days; C and A in 20 days. A alone can do the work in____? | |
A. | 20 days | |
B. | 30 days | |
C. | 40 days | |
D. | none of these | |