posted by Chadene .
Barry can do a certain job in 3 hours, whereas it takes Sanchez 5 hours to do the same job. how long would it take them to do the job working together?
1/3 + 1/5 = 8/15 jobs per hour is the rate of working together. Therefore
15/8 hour it the time need to do one job together. That would be 1 7/8 hours, or 1 hour and 52 1/2 minutes