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 alone

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.	9
B.	10
C.	8
D.	11
Answer» C. 8

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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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