Based on Eaton et al$.(1985).$ The city of Springfield has been divided into eight districts. The time $($in minutes$)$ it takes an ambulance to travel from one district to another is shown in the file P$06\_78.$xlsx$.$ This file also lists the populations of the districts. Suppose Springfield has n ambulance locations. Determine the locations of ambulances that maximize the number of people who live within two minutes of an ambulance. Do this separately for n $51$; n $52$;n $53$; n $54.($Hint: Set it up so that SolverTable can solve all four problems simultaneously.$)$ Ambulance data

Travel times $($minutes$)$

Populations of districts $(1000$s$)$