A can do a work in 24 days, B in 18 days, and C in 12 days. If they all work together, how long will

A. 4 days

B. 6 days

C. 8 days

D. 10 days

E. None of the above

Answer: B. 6 days

The combined work rate is 1/24 + 1/18 + 1/12 = 1/4. Therefore, they will complete the work in 4 days.

Posted in: Time & Work - Aptitude - Mathematics