Why the ko??
It corresponds to the 'at' in the English sentence. को is often omitted for सुबह (morning) but is necessary for other times of the day.
Post positions in Hindi, not unlike prepositions in English
when to use "ko" vs "mein"?
Mostly interchangeable though रात को is perhaps a little more common. Similar to 'at night' and 'in the night'.
Why does the question word “कहाँ” come in the middle of the sentence here, rather than coming first?
कहाँ (Where) comes right before the main verb of the sentence.
Can some one plzz explain to me why we cant say wo rat mein why ko? Can we use में?