How long is the average wait at the soda machine?
The soda machine outside the lecture hall sees a steady stream of customers throughout the day. The machine takes 4 seconds to deliver a can of carbonated sugar water once the button is pressed and students generally know what they want from the machine - the average feeding of the machine takes two seconds. Over the course of a twelve hour lecture day, students arrive at the rate of 500 per hour.
A) 15 seconds
B) 20 seconds
C) 25 seconds
D) 30 seconds
Answer: A
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