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There is some flexibility in choosing the precise route to be taken, depending upon weather conditions under consideration, where SE and LN are Seattle and London, respectively, and the other nodes represent various intermediate locations

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There is some flexibility in choosing the precise route to be taken, depending upon weather conditions under consideration, where SE and LN are Seattle and London, respectively, and the other nodes represent various intermediate locations. The winds along each arc greatly affect the flying time (and so the fuel consumption). Based on current meteorological reports. the flying times (in hours) for this particular flight are shown next to the arcs. Because the fuel consumed is so expensive, the man- agreement of Speedy Airlines has established a policy of choosing the route that minimizes the total flight time. (a) What plays the role of "distances" in interpreting this problem to be a shortest-path problem?. (b) Use the algorithm described in Sec. 10.3 to solve this shortest- path problem. c (c) Formulate and solve a spreadsheet model for this problem