A can complete a task in 24 hours, B can complete it in 18 hours. If they work together for 6 hours,

A. 1/4

B. 1/3

C. 1/2

D. 1/6

E. None of the above

Answer: B. 1/3

In 6 hours, A completes 6/24 = 1/4 and B completes 6/18 = 1/3. Together, they complete 1/4 + 1/3 = 7/12 of the task.

Posted in: Time & Work - Aptitude - Mathematics