SOLUTION: One printing press can print the first edition of a book in 28 min, whereas a second printing press requires 70 min to print the same number of copies. How long would it take to pr

Question 451511: One printing press can print the first edition of a book in 28 min, whereas a second printing press requires 70 min to print the same number of copies. How long would it take to print the first edition with both presses operating?
Answer by pedjajov(51) (Show Source): You can put this solution on YOUR website!
First press prints of the book in a minute while the second press does of the book in a minute.
Working together they will print
= = =
Now we can make a proportion that of the book both presses print in a minute and we want to find out how long it takes both presses to print one book:
1/20 book : 1 minutes = 1 book : x minutes
1/20 * x = 1 * 1
x = 1 * 1 / (1/20)
x = 20 minutes
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