Assume that tpd is the average of tPHL and tPLH. Find the delay from each input to the output in Figure 2-41 by (a) Finding tPHL and tPLH for each path, assuming tPHL = 0.20 ns and tPLH = 0.36 ns for each gate. From these values, find tpd for each path. (b) Using tpd = 0.28 ns for each gate. (c) Compare your answers from parts (a) and (b) and discuss any differences. FIGURE 2-41