AFCAT II 2017 Solved Paper

According to question,
(A+B)'s1day's work =

1

12

(B+C)'s1day's work =

1

15

(A+C)'s1day's work =

1

20

∴ (A+B)+(B+C)+(A+C) = (

1

12

+

1

15

+

1

20

)
∴ 2(A + B + C) = (

5+4+3

60

)=(

12

60

)=(

1

5

)
∴ (A + B + C)'s 1 day's work =

1

10

A, B and C together can do the work in 10 days.