Worker A takes 8 hours to do a job. Worker B takes 10 hours to do the same job. How long it take both A & B, working together but independently, to do the same job? Choose the most appropriate option:  A) 40/9 days  B) 20/9 days  C) 30/9 days  D) 60/9 days  E) 10/9 days
A's one hour work = 1/8.   B's one hour work = 1/10.   (A+B)'s one hour work = 1/8+1/10 = 9/40.   Both 40/9 days &amp; B can finish the work in 40/9 days   40/9 daysnswer : 40/9 days
<result>A</result>
Worker A takes 8 hours to do a job. Worker B takes 10 hours to do the same job. How long it take both A & B, working together but independently, to do the same job?