

MCQOPTIONS
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1. |
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 |
Answer» C. after 8 1/2 mins | |