A and B together can do a piece of work in 12 days, B and C together in 15 days and C and A together in 20 days. In how many days, can A, B and C together do it?
(a) 5 days
(b) 10 days
(c) 24 days
(d) 30 days

Submitted by: Administrator
( b ) 10 days
Submitted by: Administrator

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