Q: If A is twice as efficient as B at completing a task, and B can finish the work in 12 days independently, how many days will it take A and B to complete the work together?

A 4
B 8
C 10
D 13

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Answer: A

Explanation:

"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.

Time and Work

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Q: If A is twice as efficient as B at completing a task, and B can finish the work in 12 days independently, how many days will it take A and B to complete the work together?

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