fire station and $(2)$ the assignment of each of the other tracts to one of the fire stations. The objective is to minimize the overall average of the response times to fires.

The following table gives the average response time to a fire in each tract $($the columns$)$ if that tract is served by a station in a given tract $($the rows$).$ The bottom row gives the forecasted average number of fires that will occur in each of the tracts per day.

Formulate a BIP model for this problem. Identify any constraints that correspond to mutually exclusive alternatives or contingent decisions.