Zone 1 2 3 4 5 6 7 1 0 4 12 15 108 2 8 0 15 607 2 3 3 50 13 8 6 5 9 4 9 11 8 0 9 103 5 50 8 4 100 2 50 6 30 7 9 In 0 27 5 5 7 8 la 7 25 27 0 The district administration wants to establish several emergency response fire station units so that it can respond to any call in the city within 10 minutes. The city is divided into seven population zones. The distance between the centers of zones is known and given in the distance matrix. The response unit can be located in the center of the population zone at a cost of 10000, 8000, 12000, 11000, 9000, 9000, and 11000 respectively. Assuming average speed during an emergency is 50 Km/hour. Formulate an appropriate set covering model to determine where the unit is to be located and how the population zones are to be covered. State clearly the variables. The distance matrix between the seven zones is given in the above table. (7 marks) (Non-anonymous questiono)