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A alone can complete a work in 12 days. A and B together can complete it in 8 days. How long will B alone take to complete the work ?
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- 24 days
- 18 days
- 16 days
- 20 days
Correct Option: A
| A’s 1 day’s work = | 12 |
| (A+B)’s 1 day’s work = | 8 |
∴ B’s 1 day’s work
| = | - | 8 | 12 |
| = | = | 24 | 24 |
∴ B alone can do the work in 24 days.
Second method to solve this question ,
Here , x = 12 , y = 8
| Time taken by B = | x - y |
| Time taken by B = | = 24 days | 12 - 8 |
