A fast$-$food restaurant has three servers. Server $1$ takes the order and collects the payment, Server $2$ makes the sandwich. Server $3$ prepares and delivers the order. The activities performed by each server are described in the following Table:

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What is the capacity of the process?

Group of answer choices

$5\mathrm{.}2$ customers$/$hour

$3\mathrm{.}5$ customers$/$hour

$11\mathrm{.}2$ customers$/$hour

$20\mathrm{.}5$ customers$/$hour