Question 1173598
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            O,  it is nice lovely arithmetic problem  (!)



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If the slow team interviews 12 persons per day, then the faster team interviews 2*12 = 24 persons per day (twice as much).


Working together, they interview 12 + 24 = 36 persons per day.


Hence, the entire job will take  {{{234/36}}} days = 6.5 days.     <U>ANSWER</U>
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Solved.