How do you know what the answer to the 3rd question was? It could have been "Then whar be Xykon's throne room?" as the 2nd question (the Dungeon of Dorukan would be his response), then the extra question would have asked for a detailed description of the dungeon (supported by OtOoPC) and where it is, the exact coordinates, and the fastest route to the dungeon or if he recommends the scenic route, etc.
Since we don't know, that's exactly why it's an unresolved plot point.
Spoiler: My current mood
The world is grey, the mountains old,
The forge's fire is ashen-cold;
No harp is wrung, no hammer falls:
The darkness dwells in Durin's halls;
The shadow lies upon his tomb
In Moria, in Khazad-dûm.