Answer:
The routing suggested by the savings method is route (3,4)
Step-by-step explanation:
Savings for all trips (i, j), 1 ≤ i ∠ j ≤ 5
Total number of trips to be commuted = 10 trips
S₁₂ = C₀₁ + C₀₂ - C₁₂ = 20 + 75 - 35 = 60
S₁₃ = C₀₁ + C₀₃ - C₁₃ = 20 + 33 - 5 = 48
S₁₄ = C₀₁ + C₀₄ - C₁₄ = 20 + 10 - 20 = 10
S₁₅ = C₀₁ + C₀₅ - C₁₅ = 20 + 30 - 15 = 35
S₂₃ = C₀₂ + C₀₃ - C₂₃ = 75 + 33 - 18 = 90
S₂₄ = C₀₂ + C₀₄ - C₂₄ = 75 + 10 - 58 = 27
S₂₅ = C₀₂ + C₀₅ - C₂₅ = 75 + 30 - 42 = 63
S₃₄ = C₀₃ + C₀₄ - C₃₄ = 33 + 10 - 40 = 3
S₃₅ = C₀₃ + C₀₅ - C₃₅ = 33 + 30 - 20 = 43
S₄₅= C₀₄ + C₀₅ - C₄₅ = 10 + 30 - 25 = 15
![\begin{tabular} {|c|c|} Statement&Reason\\[1ex] Line m is parallel to line n&Given\\ \angle1\cong\angle2&Corresponding angles\\ m\angle1=m\angle2&Deifinition of Congruent angles\\ \angle2\ and\ \angle3\ form\ a\ linear\ pair&Adjacent angles on a straight line\\ \angle2\ is\ supplementary\ to\ \angle3&Deifinition of linear pair\\ m\angle2+m\angle3=180^o&Deifinition of supplementary \angle s\\ m\angle1+m\angle3=180^o&Substitution Property \end{tabular}](https://tex.z-dn.net/?f=%5Cbegin%7Btabular%7D%0A%7B%7Cc%7Cc%7C%7D%0AStatement%26Reason%5C%5C%5B1ex%5D%0ALine%20m%20is%20parallel%20to%20line%20n%26Given%5C%5C%0A%5Cangle1%5Ccong%5Cangle2%26Corresponding%20angles%5C%5C%0Am%5Cangle1%3Dm%5Cangle2%26Deifinition%20of%20Congruent%20angles%5C%5C%0A%5Cangle2%5C%20and%5C%20%5Cangle3%5C%20form%5C%20a%5C%20linear%5C%20pair%26Adjacent%20angles%20on%20a%20straight%20line%5C%5C%0A%5Cangle2%5C%20is%5C%20supplementary%5C%20to%5C%20%5Cangle3%26Deifinition%20of%20linear%20pair%5C%5C%0Am%5Cangle2%2Bm%5Cangle3%3D180%5Eo%26Deifinition%20of%20supplementary%20%5Cangle%20s%5C%5C%0Am%5Cangle1%2Bm%5Cangle3%3D180%5Eo%26Substitution%20Property%0A%5Cend%7Btabular%7D)
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