Question

A can do a piece of work in 60 days. a&b can do the same work in 40 days while b&c can do the same in 30 days. find in how many days a,b and c can complete/the whole work togather

Answer 1

a alone =60day
a&b=40, time reduced by 20 day
b&c =30 time reduced to 30 days
may be in 10&20 days