Posted by jen on Tuesday, March 9, 2010 at 1:39am.
the officejet printer can copy Janet's dissertation in 10 minutes. The laserjet printer can print the same copy in 20 minutes. If the two machines work together, how long would they take to copy the dissertation?

math  FredR, Tuesday, March 9, 2010 at 5:00am
It would take 10 minutes.

math  Reiny, Tuesday, March 9, 2010 at 7:33am
rate office jet = 1copy/10 min
rate of laserjet = 1copy/20 min
combined rate = 1copy/10 + 1copy/20 = 3copy/20minutes
time for combined rate = 1 copy/(3copy/20min) = 20/3 minutes or
6 minutes, 40 seconds
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