| Part filled in 2 hours = |
2 |
= |
1 |
| 6 |
3 |
| Remaining part = |
❨ |
1 - |
1 |
❩ |
= |
2 |
. |
| 3 |
3 |
| ∴ (A + B)'s 7 hour's work = |
2 |
| 3 |
| (A + B)'s 1 hour's work = |
2 |
| 21 |
∴ C's 1 hour's work = { (A + B + C)'s 1 hour's work } - { (A + B)'s 1 hour's work }
∴ C alone can fill the tank in 14 hours.
