A and B can do a job in 6 and 12 days respectively. They began the work together but A leaves after 3 days. Then the total number of days needed for the completion of the work is :

A and B can do a job in 6 and 12 days respectively. They began the wor

1.	A and B can do a job in 6 and 12 days respectively. They began the work together but A leaves after 3 days. Then the total number of days needed for the completion of the work is :
A.	4 days
B.	5 days
C.	6 days
D.	9 days
Answer» D. 9 days

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A and B can do a job in 6 and 12 days respectively. They began the work together but A leaves after 3 days. Then the total number of days needed for the completion of the work is :

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