SOLUTION: printer a can printer helens project in 12 minutes. printer b can print the project in 30 minutes. if the two printers worked together, how long will they take to print out the pro

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Question 1159580: printer a can printer helens project in 12 minutes. printer b can print the project in 30 minutes. if the two printers worked together, how long will they take to print out the project?
Found 2 solutions by Boreal, Shin123:
Answer by Boreal(15235) About Me  (Show Source):
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in 1 minutes printer a can do (1/12) of the project and in x minutes (x/12). Similarly, b can do (x/30)
Together, they do 1 fun project or (x/12)+(x/30)=1
multiply through by 60
5x+2x=60
x=60/7 minutes or 8.57 minutes. A does 71.4% and B does 28.6%

Answer by Shin123(626) About Me  (Show Source):
You can put this solution on YOUR website!
Printer A can complete 1%2F12 of the project in one minute. Printer B can complete 1%2F30 of the project. Together, they can complete 1%2F12%2B1%2F30=7%2F60 of the project in one minute. So it takes them 1%2F%287%2F60%29=highlight%2860%2F7%29 minutes, or highlight%288%264%2F7%29.