Table 12-4
The sentient car wash in Luther knows she is in for a busy day when dawn breaks on a gorgeous spring morning.She is capable of washing a car every four minutes, and by the looks of things, it is reasonable to expect a steady stream of twelve cars per hour arriving.Because she is fully automatic, she knows that the four-minute estimate is accurate and invariant.She values her time at $10 per hour.Yes, it seems low, but as a single bay car wash, there are few other jobs in town she is qualified for.(We won't get into her unsuccessful turn at the beauty salon.)She estimates that customer time can be valued at $15 per hour.
-According to the information provided in Table 12-4, how much time will the average customer spend waiting in line?
A)8 minutes
B)9 minutes
C)10 minute
D)11 minute

Question

Quizplus · Accepted Answer

The average customer will spend 8 minutes waiting in line. This is because the car wash can wash a car every four minutes, and there are twelve cars per hour arriving. This means that there will be an average of two cars waiting in line at any given time. Since each car takes four minutes to wash, the average customer will spend 8 minutes waiting in line.

Table 12-4 the Sentient Car Wash in Luther Knows She Is in Is