GAT Subject
Engineering
Computer Science Civil Engineering Chemical Engineering Agricultural Engineering Mechanical Engineering Electronics and Communication
37. | pipes P and Q would fill a cistern 18 and 24 minutes respectively. Both pipes being opened, find when the first pipe must be turned off so that the cistern may be just filled in 12 minutes? | |
A. | after 12 mins | |
B. | after 9 mins | |
C. | after 8 1/2 mins | |
D. | after 10 mins | |