Question

A and B can do a piece of work in
18 days, B and C in 12 days and C and A in
18 days. Find the time in which A, B and
C working together can finish the work.
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Answer 1

(A+B)'s 1 day work = =118

(B+C)'s 1 day work = =124

(C+A)'s 1 day work = =136

2 (A+B+C)'s 1 day's work = =18

Therefore, (A+B+C)'s 1 day's work = =116

Hence time taken by them to do this work together = 16 days