Before Christmas, Von Maur's free gift wrapping counter is always busy. On average, there are $5$ customers waiting in line, and $2$ customers exit the line with their wrapped package every minute. How long or average are customers waiting in this line?

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a $,1\mathrm{.}5$ minutes

b $2$ minutes

$2\mathrm{.}5$ minutes

d Larger than $3$ minutes