A can do 1 by 2 of a piece of work in 5 days. B can do 3 by 5 of the same work in 9 days and C can do 2 by 3 of that work in 8 days. In how many days can three of them, together do the work?
(1) 3 days (2) 5 days (3) 9 by 2 days (4) 4 days
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