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Q 2472391236.     A and B working together, can do a piece of work in `4 1/2` hours. B and C working together can do it in 3 hours. C and
A working together can do it in `2 1/4` hours. All of them begin the work at the same time. Find how much time they
will take to finish the piece of work?
IBPS-CLERK 2016 Mains 2001
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)