Question: The CNC grinding section has a large number of machines devoted to grinding shafts for the automotive industry. The grinding machine cycle takes 3.6 min.

The CNC grinding section has a large number of machines devoted to grinding shafts for the automotive industry. The grinding machine cycle takes 3.6 min. At the end of this cycle an operator must be present to unload and load parts, which takes 40 sec.
(a) Determine how many grinding machines the worker can service if it takes 20 sec to walk between the machines and no machine idle time is allowed.
(b) How many seconds during the work cycle is the worker idle?
(c) What is the hourly production rate of this machine cluster?

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