A and B together can complete a piece of work in 12 days, B and C can do it in 20 days and C & A can do it in 15 days. A, B and C together can complete it in.
A6 days
B9 days
C10 days
D10 1/2days
A6 days
B9 days
C10 days
D10 1/2days
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