A, B and C can do a job working alone in 20, 40 and 120 days respectively. If they worked together in how many days they can do the job?

A, B and C can do a job working alone in 20, 40 and 120 days respectiv

1.	A, B and C can do a job working alone in 20, 40 and 120 days respectively. If they worked together in how many days they can do the job?
A.	15
B.	10
C.	12
D.	9
Answer» D. 9

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A, B and C can do a job working alone in 20, 40 and 120 days respectively. If they worked together in how many days they can do the job?

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