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Time and Work - Data Intensity 2 :: Discussion
| 21. | To fill a cistern, pipes P, Q & R take 20, 15 & 12 minutes respectively. The time in minutes that the three pipes together will take to fill the cistern is:____? | |
| A. | 5 min | |
| B. | 10 min | |
| C. | 15 min | |
| D. | 20 min | |
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