Question 1009162
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A certain printer can do a printing job in 3 hours. With a second printer, the same job can be done in 2 hours. 
How long would it take the second printer to do the same job?
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The rate of work of the first printer is {{{1/3}}} of the job per hour.

The rate of work of two printers (when they work together) is {{{1/2}}} of the job per hour, according to condition.

Hence, rate of work of the second printer (if it works alone) is {{{1/2}}} - {{{1/3}}} = {{{3/6 - 2/6}}} = {{{1/6}}} of the job per hour.

It means that the second printer can do the printing job in 6 hours working alone.

For similar problems on joint work see the lessons 

  <A HREF=http://www.algebra.com/algebra/homework/Rate-of-work-word-problems/Word-problems-WORKING-TOGETHER-by-Fractions.lesson>Using fractions to solve word problems on joint work</A>  and
  <A HREF=http://www.algebra.com/algebra/homework/Rate-of-work-word-problems/Solving-more-complicated-word-problems-on-joint-work.lesson>Solving more complicated word problems on joint work</A>

in this site.
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