Question

Working together, Shawn and Hector can install a tile floor in 6 hours. It would take Shawn 9 hours to do the job alone.


What is the value of r, Hector’s rate of work in part per hour?

Answer 1

Shawn's rate = 1/9 job/hour. Together their rate = 1/6 job/hour. So Hector's rate r = 1/6 − 1/9 = 1/18 job/hour.