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A and B can separately do a piece of work in 6 days and 12 days respectively. How long will they together take to do the work ?
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- 9 days
- 18 days
- 6 days
- 4 days
Correct Option: D
| (A + B)’s 1 day’s work = | + | 6 | 12 |
| (A + B)’s 1 day’s work = | = | 12 | 4 |
∴ A and B together will complete the work in 4 days.
Second method to solve this question ,
Here , x = 6 , y = 12
| Time taken = | ||
| x + y |
| Time taken = | ||
| 6 + 12 |
| Time taken = | = 4 days | |
| 18 |
