CREATE TABLE table_3124 ("Episode Number" FLOAT, "Location" TEXT, "Original Airdate" TEXT, "Challenge Winner" TEXT, "Challenge" TEXT)

What is the original airdate of the episode where the challenge was three overstuffed sandwiches?
SELECT "Original Airdate" FROM table_3124 WHERE "Challenge" = 'Three overstuffed sandwiches'
SELECT "Original Airdate" FROM "table_3124" WHERE "Challenge" = 'Three overstuffed sandwiches'