Been puzzling over this a bit, and I think I may have an idea, but I'd like other people's opinions. When the starship fleet takes off and warps to Vulcan in response to the distress call, could they have used some kind of wormhole to get there so quickly? I'm thinking there could be a kind of natural transwarp passageway with openings in the Sol system and in the Vulcan system that enables starships to travel from point A to point B in a very quick period of time, providing the ships are at warp. This would go some way to reconciling their abnormally fast journey with what we know of warp principles in the Trek universe. We still have the problem of how the rest of the fleet reached Vulcan a few minutes ahead of the Enterprise, as the Enterprise should have been able to catch up easy enough once they were at warp (and in the passageway?) and emerged along with the rest of them.