A process time of 3 min per lb at step C translates into a throughput rate of 20 lbs/hr. This increase in process time, basically a slow down of step C, thus leads to a 10lbs/hr reduction in the capacity of step C. Because step C now becomes the only system constraint (being the slowest of the five steps), the system capacity is now 20 lbs/hr, or 10 lbs/hour lower than the base case