3) A zone-to-zone case conveyor system releases the upstream product (A) as soon as the downstream product(B) clears the zone control photo eye. a) What is the maximum rate that can be achieved through this system with a 1.5 (18") case? b) How long will it take in seconds for the zone B photo eye to become clear (not blocked by the package)? c) How long will it be clear (unblocked) before it is blocked again