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Pipes and Cisterns - Data Intensity 1 :: Discussion
| 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 | |
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