These two time options are given in the text: - Ensuite, vers dix heures et demie AND Ensuite, vers vingt-deux heures trente,
These are two different times, one before midday and the other after midday. Are they both correct in this instance because the evening setting has already been mentioned?
If I understand correctly, you think that "vers dix heures et demie" can only mean "at around 10:30 AM" ("time before midday")? This is not correct, it can also mean "at around 10:30 PM". In the exercise the context seems to make it clear which is meant.
When this is would not be the case, one could make this clear by using either "vers dix heures et demie du matin" or "vers dix heures et demie du soir". See https://french.kwiziq.com/revision/grammar/how-to-tell-time-in-french-am-vs-pm.
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