CREATE TABLE table_25664518_3 (itv1_weekly_ranking INT, viewers__millions_ VARCHAR)

What is the minimum ITV1 ranking for the episode having viewership of 5.42 million?
SELECT MIN(itv1_weekly_ranking) FROM table_25664518_3 WHERE viewers__millions_ = "5.42"
SELECT MIN("itv1_weekly_ranking") FROM "table_25664518_3" WHERE "5.42" = "viewers__millions_"