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Time and Work - Data Intensity 1 :: Discussion
| 32. | Two pipes P and Q can fill a cistern in 12 min. and 15 min. respectively but a third pipe �R� can empty the full tank in 6 min. P and Q are kept open for 5 min. in the beginning and then �R� is also opene In what time is the cistern emptied ? | |
| A. | 30 min | |
| B. | 35 min | |
| C. | 40 min | |
| D. | 45 min | |
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