C can do a work alone in 120 days. B is twice as efficient as C and A is thrice as efficient as B. In how many days can they work Finish together?

C can do a work alone in 120 days. B is twice as efficient as C and A

1.	C can do a work alone in 120 days. B is twice as efficient as C and A is thrice as efficient as B. In how many days can they work Finish together?
A.	16.67
B.	13.33
C.	12.5
D.	15
Answer» C. 12.5

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C can do a work alone in 120 days. B is twice as efficient as C and A is thrice as efficient as B. In how many days can they work Finish together?

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