A can complete a work in 10 days, while B can complete the same work in 15 days. How long will it take for both A and B to complete the work together?

Answer: A. 6 days
The combined work rate of A and B is 1/10 + 1/15 = 1/6. Therefore, they can complete the work together in 6 days.
Posted in:  Time & Work -  Aptitude -  Mathematics