- A 4
- B 8
- C 10
- D 13
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Answer:
A
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"If B's work rate is 1/12 of the task per day,
and A's work rate is twice as fast as B's, meaning it is 1/6 of the task per day,
then the combined work rate of A and B is
(1/6 + 1/12) of the task per day, which is equal to 1/4 of the task per day.
Therefore, it will take A and B 4 days to complete the work together.
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