A $2-8($Algo$)$ A campus deli serves...

campus deli serves $300$ customers over its busy lunch period from $11$:$30$ a$.$m$.$ to $1$:$30$ p$.$m$.$ A quick count of the number of customers vaiting in line and being served by the sandwich makers shows that an average of $7$ customers are in process at any point in time. What is the average amount of time that a customer spends in process?

Note: Round your final answer to $1$ decimal place.

Average amount of time

minutes