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A and B together can do a piece of work in 10 days. A alone can do it in 30 days. The time in which B alone can do it is
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- 10 days
- 12 days
- 15 days
- 20 days
Correct Option: C
| (A + B)’s 1 day’s work = | 10 |
| A’s 1 day’s work = | 30 |
| ∴ B’s 1 day’s work = | - | 10 | 30 |
| B’s 1 day’s work = | = | = | 30 | 30 | 15 |
Hence, B, alone can complete the work in 15 days.
Second method to solve this question ,
Here , x = 30 , y = 10
| Time taken by B = | x - y |
| Time taken by B = | = 15 days | 30 - 10 |
