Figure 15-1 the Following Information Relates to Markely Manufacturing

Figure 15-1 The following information relates to Markely Manufacturing:
To produce a unit of product:
There is a wait time of 8 minutes before the mixing department begins a batch, 5 minutes between the mixing and molding departments, a move and pre-wait between molding and casting of 10 minutes, and a move and pre-wait between the casting and finishing departments of 12 minutes.
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Refer to Figure 15-1.What is the production rate?

A) 30 units per hour
B) 4 units per hour
C) 10 units per hour
D) 15 units per hour