A and B can do a piece of work in 15 days; B and C can do it in 12 days while C and A can finish it 20 days; in how many days will A,B,C finish it working together?
A and B can do a piece of work in 15 days; B and C can do it in 12 days while C and A can finish it 20 days; in how many days will A,B,C finish it working together?