$24$

$5$ points

A campus deli serves $78$ customers per hour over its busy lunch period. A quick count of the number of customers waiting in line and being served by the sandwich

makers shows that an average of $11$ customers are in process at any point in time.

On average, a customer spends

mins in process. $($Round off your answer to the FIRST decimal point$)$

$($Difficulty Level $-$ Hard$)$

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