Starbucks employs one worker to make both espresso drinks and to pour drip coffee.

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Starbucks employs one worker to make both espresso drinks and to pour drip coffee.  On average, an espresso drink takes 4 minutes to make and drip coffee takes 1 minute to pour.  The number of customers that order espresso drinks is 6 per hour and the number of customers that order drip coffee is 18 per hour.  What is the utilization of the Starbucks coffee employee?