A national truck rental services have a surplus of one truck in each of the cities, 1, 2, 3, 4, 5, and 6 and a deficit of one truck in each of the cities 7,8,9,10,11 and 12. The distance (in kilometers) between the cities with a surplus and cities with deficit are displayed below: How should the trucks be displayed so as to minimize the total distance travelled? (10 marks) 1 2 3 4 5 6 41 72 39 52 25 51 22 29 49 65 81 50 27 39 60 51 32 32 45 50 48 52 37 43 29 40 39 26 30 33 82 40 40 60 51 30