Question

A alone can complete a piece of work in 15 days, and B alone can complete it in 20 days. They work together, but every third day B does not work. In how many days will the whole work be completed?

A 9 (6/7) days
B 9 days
C 9 (3/4) days
D 10 days
Practice Next

More Time and work Questions

Hey! Ask a query