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A and B together can do a piece of work in 6 days. If A can alone do the work in 18 days, then the number of days required for B to finish the work is
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- 10
- 12
- 9
- 15
Correct Option: C
| (A + B)’s 1 day’s work = | 6 |
| A’s 1 day’s work = | 18 |
| ∴ B’s 1 day’s work = | - | |||
| 6 | 18 |
| = | = | = | ||||
| 18 | 18 | 9 |
∴ Required time = 9 days
Aliter : Using Rule 4,
| Time taken by B = | days | x - y |
| = | = 9 days | 18 - 6 |
