For a Fast-Food Restaurant,the Average Waiting Time Can Be Formulated

Multiple Choice

For a fast-food restaurant,the average waiting time can be formulated as ________.

A)
$\frac{\text {[(average number of customers) }\times \text { (average serving time) }^2]}{2 \times \text {[serving capacity - (avg. no. of customers }\times \text { avg. serving time) ]}}$


B)
$\frac{[\text { ( average number of customers ) } \times \text { average serving time } ^ { 2 } ) ]}{ \text {(serving capacity - (avg. no. of customers }\times \text{avg. serving time) }}$


C)
$\frac{\left[(\text { average customers per hour }) \times(\text { average serving time }) ^{2}\right]}{60 \text { minutes }}$


D)
$\frac{\text {[(average customers per hour) X (average serving time ) }}{\text {(60 minutes) X (number of workers) }}$