pry or the process: . The preheater can process 120 tons per hour. . The lock hoppers can process 110 tons per hour. . The analysis of the Ieaction steps is somewhat more complicated. We first observe that at any given moment of time, there can be, at maximum, 28 tons in the first reactor. Given that the iron ore needs to spend 15 minutes in the reactor, we can use Little's Law (see Chapter 2) to see that the maximum amount of are that can flow through the reactor and spend 15 minutes in the reactoris 28 tons = Flow rate x 0.25 hour => Flow rate = 112 tonslhour