Becton-Dickinson manufactures medical supplies such as syringes.7 In one plant it had 10 parallel syringe manufacturing lines. The problem was that syringes kept getting stuck in the lines, shutting the lines down. On average, a line got stuck again one minute after a blockage was removed (this time was distributed Exponentially). One operator was assigned to five lines (i.e., a total of two operators). The average time it took the operator to walk to the blocked line and fix the problem was 10 seconds (this time was distributed Exponentially). How long was a line expected to be down per hour? Assume that the two operators do not help each other.