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Pipes and Cisterns - Data Intensity 1 :: Discussion
| 2. | A cistern can be filled by a tap in 4 hours while it can be emptied by another tap in 9 hours. If both the taps are opened simultaneously, then after how much time will the cistern get filled? | |
| A. | 4.5 hrs | |
| B. | 5 hrs | |
| C. | 6.5 hrs | |
| D. | 7.2 hrs | |
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