A copy center, which processes online orders, receives $3$ order per minute on average. On average it takes $4$ minute to configure the copy machine and $7\mathrm{.}5$ minutes to process the order.

Required:

Average number of orders received per minute $3$

Average number of minutes to configure the copy machine $4$

Average number of minutes to process an order $7\mathrm{.}5$

On average, how many separate orders are being processed $($setup or copy$)$ at any given time?

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