A company owns a machine that will produce 100 light switches in four hours. Due to increased demand, a second machine capable of producing 100 light switches in three hours has been added. Approximately how many hours will it take to produce 100 light switches using both machines working together?

Question

Quizplus · Accepted Answer

The first machine produces 100 light switches in 4 hours, so its rate is 25 switches per hour. The second machine produces 100 switches in 3 hours, so its rate is approximately 33.33 switches per hour. Together, they produce 58.33 switches per hour. To produce 100 switches, it will take approximately 100 / 58.33 = 1.71 hours.

A Company Owns a Machine That Will Produce 100 Light