Xiaohong was late for the movie because of something, so she only watched the whole movie (3/10). This movie needs to be shown for 1 hour and 40 minutes and ends at 4:30. When did Xiaohong enter the movie theater?
小红因有事看电影迟到了，所以只看了整场电影的(3/10)，这场电影需放映一小时40分，在4时30分结束，小红是在什么时候进电影院的？
<result>4</result>