A and B together can do a work in 12 days. B and C together do it in 15 days. If A s efficiency is twice that of C, then the days required for B alone to finish the work is

A and B together can do a work in 12 days. B and C together do it in 1

1.	A and B together can do a work in 12 days. B and C together do it in 15 days. If A s efficiency is twice that of C, then the days required for B alone to finish the work is
A.	60 days
B.	30 days
C.	20 days
D.	15 days
Answer» D. 15 days

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A and B together can do a work in 12 days. B and C together do it in 15 days. If A s efficiency is twice that of C, then the days required for B alone to finish the work is

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