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A and B can do a job together in 12 days. A is 2 times as efficient as B. In how many days can B alone complete the work ?
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- 18 days
- 9 days
- 36 days
- 12 days
Correct Option: C
Using Rule 2,
If A alone completes the work in x days, B will complete the same in 2x days.
| ∴ | + | = | ||||
| x | 2x | 12 |
| = | = | |||
| 2x | 12 |
⇒ 2x = 36
∴ B alone will complete the work in 36 days (i.e. 2x ).
