An experienced computer technician can set up a network in 12 hours. It would take an intern 20 hours to set up the same network. If they work together, how long will it take to set up the network? The rate of the experienced technician is If the experienced technician and intern work 1/12 together, then we assume that the time COMPLETE they work is the same. 

An experienced computer technician can set up a network in 12 hours. It would take an intern 20 hours to set up the same network. If they work together, how long will it take to set up the network? The rate of the experienced technician is If the experienced technician and intern work 1/12 together, then we assume that the time COMPLETE they work is the same.