Chandra can embroider logos on a team's sweatshirts in 6 hr. Traci, a new employee, needs 9 hr to complete the same job. Working together, how long will it take them to do the job?
We have performance in terms of hours per job. Rewrite both employee's performances in terms of jobs per hour:
Chandra = C = 1/6 jobs/hr
Traci = T = 1/9 jobs/hr
Between them speed = T + C = 1/6 + 1/9 = 3/18 + 2/18 = 5/18 jobs/hr
So hours per job = 18/5 hr/job
So the job takes 18/5 = 3.6hr
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