The employee responsible for serving food to customers in a popular restaurant receives $0\mathrm{.}25$ customers per minute on average... If you know that the rate of customers arriving at the restaurant is $10$ customers per hour on average... What is required is the expected average waiting time for a customer in the store?

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Select one:

$8$ minutes.a

$12$ minutes b

$0\mathrm{.}1$ hour.

hour $0\mathrm{.}3.$d