SSC CPO SI and ASI Model Paper 9

(2) In 1 day,
(A + B) can do ¼ of the work.
(B + C) can do 1/5 of the work.
(A + C) can do 1/3 of the work.
Adding, 2(A +B + C) = 47/60 of thework
Or, A + B + C = 47/120
∴ A, B and C together will need120/47 days to finish the work.