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| 1. |
A cistern is filled by one tap in 12 minutes and emptied by another in 10 minutes. If the second pipe is opened 3 minutes after the first, at what time more will the cistern be emptied? |
| Answer» A cistern is filled by one tap in 12 minutes and emptied by another in 10 minutes. If the second pipe is opened 3 minutes after the first, at what time more will the cistern be emptied? | |