A and B can do a piece of work in 12 days; B and C in 15 days; C and A in 20 days. A alone can do the work in__________?

A and B can do a piece of work in 12 days; B and C in 15 days; C and A

1.	A and B can do a piece of work in 12 days; B and C in 15 days; C and A in 20 days. A alone can do the work in__________?
A.	20 days
B.	30 days
C.	40 days
D.	none of these
Answer» C. 40 days

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A and B can do a piece of work in 12 days; B and C in 15 days; C and A in 20 days. A alone can do the work in__________?

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