A and B can do a work in 12 days. B and C can do the same work in 15 days and C and A can do the same work in 20...

A and B can do a work in 12 days, Band C can do the same work in 15 days, C and A can do the same work in 20 days. The time taken by A, B and C to do the same work is

A and B can do a certain work in 12 days. B & C can do the same work in 15 days, while A and C can do the same work in 36 days. In how many days will all three together complete that work?

A and B can do a certain work in 12 days, B & C can do the same work in 15 days, while A and C can do the same work in 36 days. In how many days will all three together complete that work ?