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.	15
B.	/
C.	24 days
D.	30 days
E.	4 days
Answer» D. 30 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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