=E*6.13. Reconsider the Littletown Fire Department problem presented in Section 6.4 and depicted in Figure 6.11. Due to maintenance work on the one-mile road between nodes A and B, a detour currently must be taken that extends the trip between these nodes to four miles.

Formulate and solve a spreadsheet model for this revised problem to find the new shortest path from the fire station to the farming community.