Answers

2015-08-16T13:19:34+08:00
Let x = time the old computer takes to complete a whole mailing
y = time the newer model takes to complete a whole mailing
since x = 6 hours we solve:
(1/6) + (1/y) = (1/2) --> we multiply with 6y: y + 6 = 3y --> 6 = 2y --> 3 hours = y
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