**Solve the Problem:**

Let’s run the program and see what the plot looks like:

Well, not much more to say. From the plot, x_w(t = 5 hours) is about 0.35. Henley and Seader calculated x_{w} (t = 5 hours) = 0.351. I’d say pretty close. It’s easy to calculate W(t). It is 100 kg – 10 kg/hr*5 hr = 50 kg. So, this one is pretty easy. I’m not sure what to do next, I’ll think about it. Any suggestions?