Worker A takes 8 hours to do a job. Worker B takes 10 hours to do the same job. How long should it take both A and B, working together but indepently, to do the same job?

Worker A takes 8 hours to do a job. Worker B takes 10 hours to do the

1.	Worker A takes 8 hours to do a job. Worker B takes 10 hours to do the same job. How long should it take both A and B, working together but indepently, to do the same job?
A.	4x4/9
B.	2x4/9
C.	4x2/9
D.	5x4/9
Answer» B. 2x4/9