help me. do it asap

that is all about the question i can get from my professor. it's deterministics in operation research subject.

A distribution center is located at A, which has to ship a truck with refills to nine nearby cities B, C.D...., J. Distances (in kilometers) between pairs of nearby cities are provided in Table 3.1. The daily demand (in cartons) for each of the nine cities B, C, D, ..., J is shown in Table 3.2. Just 60 cartons can be carried on the trucks used for delivery. How many trucks are required for distribution? How could these trucks be routed from the distribution center A to the cities and back to A in such a way that the cumulative number of kilometers traveled by these trucks is minimal? A B C D E F G H I J A 20 30 10 40 20 32 15 25 14 B 20 35 24 15 20 25 19 11 10 C 30 35 12 18 21 32 22 28 16 D1024 12 17 20 29 24 32 28 E 40 15 18 17 -13 19 12 21 34 F 20 2021 20 13 15 30 25 22 G 32 25 32 29 19 15 1812 17 H 15 19 22 24 12 30 18 22 27 I 25 11 28 32 21 25 12 22 - 32 J 14 10 16 28 34 22 17 27 32 Table 3.1 B C D E F G H I Deterministic Models in Operations Research Demand 20 30 40 10 25 15 35 10 20 Table 3.2 A distribution center is located at A, which has to ship a truck with refills to nine nearby cities B, C.D...., J. Distances (in kilometers) between pairs of nearby cities are provided in Table 3.1. The daily demand (in cartons) for each of the nine cities B, C, D, ..., J is shown in Table 3.2. Just 60 cartons can be carried on the trucks used for delivery. How many trucks are required for distribution? How could these trucks be routed from the distribution center A to the cities and back to A in such a way that the cumulative number of kilometers traveled by these trucks is minimal? A B C D E F G H I J A 20 30 10 40 20 32 15 25 14 B 20 35 24 15 20 25 19 11 10 C 30 35 12 18 21 32 22 28 16 D1024 12 17 20 29 24 32 28 E 40 15 18 17 -13 19 12 21 34 F 20 2021 20 13 15 30 25 22 G 32 25 32 29 19 15 1812 17 H 15 19 22 24 12 30 18 22 27 I 25 11 28 32 21 25 12 22 - 32 J 14 10 16 28 34 22 17 27 32 Table 3.1 B C D E F G H I Deterministic Models in Operations Research Demand 20 30 40 10 25 15 35 10 20 Table 3.2