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A can do a piece of work in 4 days and B can do it in 12 days. In how many days will they finish the work, both working together ?
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- 4 days
- 6 days
- 2 days
- 3 days
Correct Option: D
| A’s 1 day’s work = | ||
| 4 |
| B’s 1 day’s work = | ||
| 12 |
| (A + B)’s 1 day’s work = | + | 4 | 12 |
| (A + B)’s 1 day’s work = | = | 12 | 3 |
∴ Required time = 3 days
Second method to solve this question ,
| Time taken = | days | |
| x + y |
| Time taken = | ||
| 4 + 12 |
| Time taken = | = 3 days | |
| 16 |
