A can do a piece of work in 12 days, B can do it in 15 days. If they work together, how long will it

A can do a piece of work in 12 days, B can do it in 15 days. If they work together, how long will it take to complete the work?

A. 6.67 days

B. 7 days

C. 8 days

D. 9 days

E. None of the above

Answer: A. 6.67 days

The combined work rate of A and B is 1/12 + 1/15 = 9/60 = 3/20. Therefore, they will complete the work in 20/3 days, which is approximately 6.67 days.

Posted in: Time & Work - Aptitude - Mathematics