SOLUTION: A company's has a new printer can print checks three times faster than its old printer. with both printers operating ,the checks can be printed in 6 minutes. how long would it take

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Question 323592: A company's has a new printer can print checks three times faster than its old printer. with both printers operating ,the checks can be printed in 6 minutes. how long would it take to print the checks with the new printer only ?''
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
In words:
(printing rate of old printer) + (printing rate of new printer) = (printing rate together)
And, making this more detailed:
(o.p. rate in checks/min) + (n.p. rate in checks/min) = (rate together in checks/min)
Let old printer's rate = r checks/min
given:
New printer's rate = 3r checks/min
Printing rate together = 1%2F6 one check printing job/min
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Note that I am calling all the checks printed = 1 printing job
3r+%2B+r+=+1%2F6
4r+=+1%2F6
r+=+1%2F24
So, the old printer's rate is 1 check printing job in 24 min
3r+=+3%2F24
3r+=+1%2F8
So, the new printer's rate is 1 check printing job in 8 min
check answer:
3%2F24+%2B+1%2F24+=+1%2F6
4%2F24+=+4%2F24
OK