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 independently, to do the same job?  Choose the correct choice from the following:
A) 70 hours
B) 40/9 hours
C) 9 hours
D) 16 hours
E) 20 hours
A’s 1 hour's work = 1/8   B's 1 hour's work = 1/10   (A + B)'s 1 hour's work = (1/8) +(1/10)=9/40   Both A and B will finish the work in 40/9 days.   ANSWER 40/9 hours 40/9 hours
<result>B</result>
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 independently, to do the same job?