Question 261059
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You are soooo close.  If printer A can do the whole job in 14 minutes, then it can do 1/14 of the job in 1 minute.  Likewise printer B can do 1/12 of the job in 1 minute.  So when you add 1/14 of the job to 1/12 of the job, you get that both machines working together can do 13/84 of the job in one minute, therefore they can go the whole job in 84/13 minutes, just under 6 and a half minutes.



John
*[tex \LARGE e^{i\pi} + 1 = 0]
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