The factory is in operation 7 hours per shift 2 shifts per day. Daily 400 motors are

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Question:

The factory is in operation 7 hours per shift 2 shifts per day. Daily 400 motors are shipped. Your production cells assembled the frame, 3 shafts, and 6 bearings. It takes 21 minutes to assemble a frame, 10 minutes to assemble a shaft, and 3.5 minutes to assemble a bearing. What is the pitch?