Need help with part b only

A construction company must transport materials from its storage facility to a job site. The table below provides information on the travel times, in minutes, between locations. The storage facility is indicated as node 1 and the job site is indicated as node 7 ; the transshipment nodes represent road intersections. Note that some connections are unidirectional and some are bidirectional; in the table, the row number represents the "from" node and the column number represents the "to" node. Connections that do not exist are indicated by a dashed line. For example, the travel time from node 1 to node 2 is 13 minutes, but travel from node 2 to node 1 is infeasible. (a) Draw the network diagram for this problem. (b) Develop a linear programming model to determine the route from the storage facility to the job site that minimizes the total travel time. You do not need to solve the LP. A construction company must transport materials from its storage facility to a job site. The table below provides information on the travel times, in minutes, between locations. The storage facility is indicated as node 1 and the job site is indicated as node 7 ; the transshipment nodes represent road intersections. Note that some connections are unidirectional and some are bidirectional; in the table, the row number represents the "from" node and the column number represents the "to" node. Connections that do not exist are indicated by a dashed line. For example, the travel time from node 1 to node 2 is 13 minutes, but travel from node 2 to node 1 is infeasible. (a) Draw the network diagram for this problem. (b) Develop a linear programming model to determine the route from the storage facility to the job site that minimizes the total travel time. You do not need to solve the LP