Q1  one press machine, jobs sorted by finishing time
    J1  08:00-09:00   TAKE
    J2  08:30-09:30   skip (overlaps)
    J3  09:00-09:50   TAKE
    J7  09:40-10:20   skip (overlaps)
    J4  08:45-10:30   skip (overlaps)
    J5  09:55-10:45   TAKE
    J6  10:30-11:30   skip (overlaps)
    J8  10:50-12:00   TAKE
    jobs scheduled = 4

Q2  collection route (MST weight 22, so no tour is shorter than 22)
    Depot -> Keputih -> Gebang -> Klampis -> Manyar -> Semolowaru -> Depot
    full walk costs 2 x MST = 44; dropping repeats gives 40 blocks, and the theorem of 16.6 guarantees
    this is at most twice the unknown optimum

Q3  shortest road distance from the depot
    Depot          0 blocks
    Klampis        3 blocks
    Keputih        4 blocks
    Manyar         8 blocks
    Gebang         9 blocks
    Semolowaru    11 blocks
