SOLUTION: One printing press can print the first edition of a book in 55 min. A second printing press requires 66 min to print the same number of copies. How long would it take to print the

Algebra ->  Equations -> SOLUTION: One printing press can print the first edition of a book in 55 min. A second printing press requires 66 min to print the same number of copies. How long would it take to print the       Log On


   

Question 1173834: One printing press can print the first edition of a book in 55 min. A second printing press requires 66 min to print the same number of copies. How long would it take to print the first edition of the book with both presses operating?
Answer by ikleyn(52786) About Me  (Show Source):
You can put this solution on YOUR website!
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The combined rate of work is  1%2F55 + 1%2F66  of the job per minute


    1%2F55 + 1%2F66  = %281%2F11%29%2A%281%2F5+%2B+1%2F6%29 = %281%2F11%29%2A%286%2F30+%2B+5%2F30%29 = %281%2F11%29%2A%2811%2F30%29 = 1%2F30.


Hence, the entire job will be completed in 30 minutes, with both machines working together.    ANSWER

Solved.