Worker A takes 8 hours to do a job. Worker B takes 12 hours to do the same job. How long it take both A & B, working together but independently, to do the same job? Pick
A) 40 days  B) 24/5 days  C) 39/9 days  D) 30/9 days  E) 60/9 days
A's one hour work = 1/8.   B's one hour work = 1/12.   (A+B)'s one hour work = 1/8+1/12 = 5/24.   24/5 daysoth A &amp; 24/5 days can finish the work in 24/5 days   24/5 days
<result>B</result>
Worker A takes 8 hours to do a job. Worker B takes 12 hours to do the same job. How long it take both A & B, working together but independently, to do the same job?