## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$2$ haircuts completed per hour
At 2 P.M., a total of 7 haircuts were completed. By 4:30 P.M., a total of 12 haircuts were completed. The increase in number of haircuts completed was: $=12-7=5$ The elapsed time from 2 p.m.. to 4:30 p.m. is 2.5 hours. Thus, the average rate is: $=\dfrac{5\text{ haircuts completed}}{2.5 \text{ hours}}=2$ haircuts completed per hour