This problem is driving me nuts, help would be greatly appreciated.

"One person can do a job in 8 hours. A second person can do it in 12 hours. If the first person works 2 hours less than the second, how many hours will it take them working together?"

If they worked at the same time, i know the answer is just under 5 hours total...but the first person has to work 2 hours less, and i dont know how to insert that in.

Any ideas? thanks!