If it takes two teams of factory workers 6 days to complete a task. How many days will it take each team working separately, to complete the same task if it will take one of the teams 3 days earlier to complete the task.  Choose the correct answer:
A) 10 and 15
B) 5 and 8
C) 4 and 7
D) 9 and 12
E) 3 and 6
Work = (A)(B)/(A+B) where A and B are the individual times of each entity.   Here, we're told that (working together) the two teams would complete a job in 6 days. This means that (individually) each team would take MORE than 6 days to do the job.   Answers E, B and C are illogical, since the individual times must both be greater than 6 days.   so we can TEST the values for Answers D and E.   Using the values for Answers D and A, we have...   10 and 15nswer D: (9)(12)/(9+12) = 108/21 = 5.14 This is NOT a match   10 and 15nswer 10 and 15: (10)(15)/(10+115) = 150/25= 
<gadget id="calculator">150/25</gadget>
<output>6</output>
6 This IS a match   Final 10 and 15nswer:   10 and 15
<result>A</result>
If it takes two teams of factory workers 6 days to complete a task. How many days will it take each team working separately, to complete the same task if it will take one of the teams 3 days earlier to complete the task.