A and B can complete a piece of task together in 12 days, while A alone can do it in 15 days. They start working together but A leaves 10 days before the completion of the task. For how many days did A and B work together?

A and B can complete a piece of task together in 12 days, while A alon

1.	A and B can complete a piece of task together in 12 days, while A alone can do it in 15 days. They start working together but A leaves 10 days before the completion of the task. For how many days did A and B work together?
A.	10
B.	11
C.	8
D.	9
Answer» B. 11

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A and B can complete a piece of task together in 12 days, while A alone can do it in 15 days. They start working together but A leaves 10 days before the completion of the task. For how many days did A and B work together?

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