Worker A takes 7 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 correct choice from the following options:
A) 70/17
B) 40/9
C) 50/9
D) 60/9
E) 80/9
one day work of 70/17 = 1/7   one day work of B = 1/10   so one day work of 70/17 and B together = 1/7 + 1/10 = 17/70   so total days required = 70/17   70/17NSWER:70/17
<result>A</result>
Worker A takes 7 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?