CREATE TABLE table_64575 ("County" TEXT, "Location" TEXT, "Distance" FLOAT, "Total" FLOAT, "Notes" TEXT)

How much Distance has Notes of north end terminus of ar 155?
SELECT SUM("Distance") FROM table_64575 WHERE "Notes" = 'north end terminus of ar 155'
SELECT SUM("Distance") FROM "table_64575" WHERE "Notes" = 'north end terminus of ar 155'