SOLUTION: one printing press can print the first edition of a book in 55 min, whereas a second printing press requires 66 min to print the same number or copies. how long would it take to pr

Question 446849: one printing press can print the first edition of a book in 55 min, whereas a second printing press requires 66 min to print the same number or copies. how long would it take to print the first edition with both presses operating
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
Typing one edition is 1 job
Machine I 55 minutes
It does 1/55 of the job in 1 minute
Machine II 66 minutes
It does 1/66 of thejob in 1 minute

Together they will do 1/55 + 1/66
Together they will do 1/30 of the job in one minute
So they will take 30 minutes

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