A,B and C can do a piece of work in 6,8 and 12 days respectively. In how many days would all of them complete the same job together?  Choose the correct choice from the following answers:
A) 5 2/3 days.
B) 3 2/3 days.
C) 2 2/3 days.
D) 4 2/3 days.
E) 1 2/3 days.
Explanation:   A,B and C can do the work in 6,8 and 12 days respectively. Therefore,   part done by A in 1 day =1/6   part done by B in 1 day = 1/8   part done by C in 1 day = 1/12   part done by A,B and C in 1 day = 1/6+1/8+1/12   =9/24   Net job can be done by A,B,C together in 1 day =24/9 =2 2/3 days.   Answer: Option 2 2/3 days.
<result>C</result>
A,B and C can do a piece of work in 6,8 and 12 days respectively. In how many days would all of them complete the same job together?