SOLUTION: Printer A can print Helens project in 12 minutes. printer B can print the project in 42 minutes. If the two work together how long would it take to print the project ?

Question 980732: Printer A can print Helens project in 12 minutes. printer B can print the project in 42 minutes. If the two work together how long would it take to print the project ?
Answer by macston(5194) (Show Source): You can put this solution on YOUR website!
Printer A: 1 project/12 minutes=1/12 project/min
Printer B: 1 project/42 minutes=1/42 project/min
Together: 1/12 project/min + 1/42 project/min=(7/84+2/84)project/min = 9/84_project/min
To print 1 project at 9/84 project/min:
(1_ project)/(9/84_project/min)=9.33minutes

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