A can do a piece of work in 6 days B in 8 days and C in 12 days. All begin to do it together but A leaves after 2 days, and B leaves3 days before the completion of work. How long did the work last? (1) 9 days (2) 8 days (3) 7days (4) NONE OF THESE
days, and B leaves3 days before the completion of work. How long did the work last?
(1) 9 days (2) 8 days (3) 7days (4) NONE OF THESE