CREATE TABLE table_60420 ("Tie no" TEXT, "Home team" TEXT, "Score" TEXT, "Away team" TEXT, "Date" TEXT)

What was the tie number for the game with an away team of Hartlepool United?
SELECT "Tie no" FROM table_60420 WHERE "Away team" = 'hartlepool united'
SELECT "Tie no" FROM "table_60420" WHERE "Away team" = 'hartlepool united'