----------------  SOLUTION  -------------------

solution cost   : 723.541
number of trips : 4

trip 1, 11 customers, sequence : 42 41 30 32 31 34 40 39 36 38 37 
   weight    : 2004
   volume    : 11
   trip cost : 113.467

trip 2, 8 customers, sequence : 8 19 22 23 26 25 20 21 
   weight    : 2010
   volume    : 8
   trip cost : 147.544

trip 3, 6 customers, sequence : 24 9 15 1 2 16 
   weight    : 1612
   volume    : 6
   trip cost : 24.7236

trip 4, 19 customers, sequence : 43 44 28 33 29 27 6 5 7 35 3 4 14 13 12 11 18 17 10 
   weight    : 1594
   volume    : 19
   trip cost : 437.807