A cistern is normally filled with water in 10 hours but takes 5 hours longer to fill because of a leak in its bottom. If the cistern is full, the leak will empty the cistern in
| Question | A cistern is normally filled with water in 10 hours but takes 5 hours longer to fill because of a leak in its bottom. If the cistern is full, the leak will empty the cistern in | |
| Type | multiple_choice | |
| Option | 20 hours | incorrect |
| Option | 40 hours | incorrect |
| Option | 50 hours | incorrect |
| Option | 30 hours | correct |
Solution
