CREATE TABLE table_40686 ("Year" FLOAT, "Class" TEXT, "Team" TEXT, "Points" FLOAT, "Rank" TEXT, "Wins" FLOAT)

What is the sum of Points for 250cc class, ranked 13th, later than 1955?
SELECT SUM("Points") FROM table_40686 WHERE "Class" = '250cc' AND "Rank" = '13th' AND "Year" > '1955'
SELECT SUM("Points") FROM "table_40686" WHERE "Class" = '250cc' AND "Rank" = '13th' AND "Year" > '1955'