For problem 4s: Each nurse's route is shown below:
nurse 0:
(18,2)->(19,4)->(19,4)->(19,4)->(19,4)->(19,4)->(18,2)
The total travel length is 4.47214.
nurse 1:
(18,2)->(19,4)->(19,4)->(19,4)->(19,4)->(19,4)->(18,2)
The total travel length is 4.47214.
nurse 2:
(18,2)->(45,32)->(13,44)->(28,60)->(32,49)->(34,38)->(18,2)
The total travel length is 158.749.
nurse 3:
(55,60)->(66,16)->(85,21)->(90,57)->(71,96)->(55,71)->(55,60)
The total travel length is 185.41.
nurse 4:
(55,60)->(66,16)->(6,89)->(6,89)->(6,89)->(22,75)->(55,60)
The total travel length is 197.357.
nurse 5:
(55,60)->(91,3)->(76,11)->(66,16)->(66,16)->(66,16)->(55,60)
The total travel length is 140.951.