Correct Answer: Option C
(A + B + C)'s 1 day's work = 1/6;
(A + B)'s 1 day's work = 1/8;
(B + C)'s 1 day's work = 1/12.
Therefore, (A + C)'s 1 day's work
= {2 x (1/6)} – {(1/8) + (1/12)}
=(1/3 – 5/24)
= 3/24
=1/8.
So, A and C together will do the work in 8 days.
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