I am not sure if my answers are correct. (especially (a) ) I would be grateful if teachers could help me.
a) When do we get there?
b) When will we get there?
In (a)the question is on the time or day of the habitual action that normally take to get to a certain place. Whereas in (b) it indicates a future event that ‘we’ are preparing to go to a certain place but ‘we’ still not certain about the time or day to get there.
Practically speaking, there is no difference between the two questions. The speaker is asking for the same information in either case. Perhaps I would change my mind if I had additional context, but it is not likely.
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