A, B and C can complete a piece of work in 24, 6 and 12 days respectively

A, B and C can complete a piece of work in 24, 6 and 12 days respectively. Working together, they will complete the same work in how many days?

A.      1/24 Day

B.      7/24 days

C.      24/7 days

D.      4 days

Sol:

(A+B+C)’s 1 day’s work =  ( 1/24 + 1/6 +1/12) = 7/24 

So, A, B and C together will complete the job in  24/7  days.