Question 165668: A laser printer can print a page in 15 s. If a 16-page document is split between this printer and an older model, the two printers take 50 s to print the document, working together. How many seconds does it take the older model to print a page?
Found 2 solutions by kev82, MathTherapy:
Answer by kev82(151)   (Show Source):
You can put this solution on YOUR website! Both printers must have finished 50s or less. The first printer takes 15s per page, so may have printed 0, 1, 2, or 3 pages during this time, which leaves 16, 15, 14, or 13 pages to the other printer. This means the other printer could take any one of 50/16, 50/15, 50/14, or 50/13 seconds per page. I don't think there is enough information to figure out which of those times is correct.
Answer by MathTherapy(10552)  (Show Source):
You can put this solution on YOUR website! Since the laser printer can print 1 page in 15s, it follows that it can print 16 pages in 240s. With this 16-page job taking both printers 50s, it means, obviously that the older printer is faster than the laser printer.
Since the laser can print 16 pages in 240s, then it can print  of the job in 1 sec.
To find what fraction of the 16-page job the old printer can do in 1 sec., when doing the job with the laser, we have:
5 + 1200a = 24
1200a = 19
a = 
Since in 1 sec., the older printer does of the job, then it can do the entire job in:
19a = 1,200
a =  = 63.15789
This means that by itself, the older printer can do the entire 16-page job in 63.15789 seconds, which means that it can do 1 page in  = 3.947368 ≈ 3.947 seconds.
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