CREATE TABLE table_18850 ("Result" TEXT, "Date" TEXT, "Race" TEXT, "Venue" TEXT, "Group" TEXT, "Distance" TEXT, "Weight  ( kg ) " FLOAT, "Jockey" TEXT, "Winner/2nd" TEXT)

What was the distance of the race in which Northerly raced in group G3?
SELECT "Distance" FROM table_18850 WHERE "Group" = 'G3'
SELECT "Distance" FROM "table_18850" WHERE "Group" = 'G3'