Q: A and B can do a work in 1 day, B and C in 2 days and C and A in 3 days. In how many days will the work be completed, if all three of them work together?
Options:
(A) 12/11
(B) 12/24
(C) 13/16
(D) 18/12
(E) 14/23 Let's give some random thoughts before answering.
One day work of A and B = 1/1
One day work of B and C = 1/2
One day work of C and A = 1/3
2(A + B + C) = 1/1+ 1/2 + 1/3
2(A + B + C) = 11/6
(A + B + C) = 11/12
Number of days required = 12/11 days.
Therefore, the answer is (A).