For problem 3s: Each nurse's route is shown below:
nurse 0:
(18,2)->(45,32)->(28,60)->(32,49)->(34,38)->(19,4)->(18,2)
The total travel length is 135.4.
nurse 1:
(18,2)->(66,16)->(55,71)->(22,75)->(6,89)->(13,44)->(18,2)
The total travel length is 248.429.
nurse 2:
(18,2)->(91,3)->(85,21)->(90,57)->(71,96)->(76,11)->(18,2)
The total travel length is 315.549