Request a quote for - A can finish the work alone in 12 days, so A’s work rate is 1/12 of the work per day.
- B can finish the work alone in 36 days, so B’s work rate is 1/36 of the work per day.
- Together, they can complete \(\frac{1}{12} + \frac{1}{36} = \frac{3+1}{36} = \frac{4}{36} = \frac{1}{9}\) of the work per day.
- Therefore, together they will complete the work in 9 days.

**✔️ Correct Answer: Option 4 - 9**

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