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

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

1.	C can do a work alone in 120 days, B twice as efficient as C and A is thrice as efficient as B. In how many days can they together complete the work?
A.	16.67
B.	13.33
C.	15
D.	12.3
Answer» C. 15

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

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