GAT Subject
Engineering
Computer Science Civil Engineering Chemical Engineering Agricultural Engineering Mechanical Engineering Electronics and Communication
52. | Two pipes A and B can fill a cistern in 20 and 30 minutes respectively, and a third pipe C can empty it in 40 minutes. How long will it take to fill the cistern if all the three are opened at the same time? | |
A. | 19 1/7 min | |
B. | 15 1/7 min | |
C. | 17 1/7 min | |
D. | 7 1/7 min | |