Suppose we have a production system as follows: ----> Machine A ----> Machine B ----> Machine C ----> Machine D ----> 3 u/hr 70 min/u 30 min/u 1.5 u/hr The above diagram shows that machine A can process 3 units of product per hour. On the other hand, each unit of product must be processed for 70 minutes of machine B. Similar information are shown for the other two machines. Assume that one unit of product requires one unit of raw material. If raw material enters the system at 2 units per hour, what is the utilization of machine C?