SOLUTION: Solve the problem. The Epson Stylus 850 can print Helen's class project in 18 minutes. The Epson Stylus 500 can print the project in 36 minutes. If the two printers work together,

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Question 309609: Solve the problem. The Epson Stylus 850 can print Helen's class project in 18 minutes. The Epson Stylus 500 can print the project in 36 minutes. If the two printers work together, how long would they take to print out the project?
Answer by mananth(12270) About Me  (Show Source):
You can put this solution on YOUR website!
stylus 850 - 1 job -18 minutes
in 60 minutes it can do 60/18 jobs.
.
stylus 500 - 1 job 36 minutes
60 minutes it will do 60/36 jobs
.
together they can do 60/36+60/18 jobs in 1 hour
=60+120 / 36
=180/36 jobs in i hour
for the whole job they take 36/180 * 60 minutes
=12 minutes