Simultanous movement question

[Griffin]

Hi all,
If two fleets with differing speed left for a particular point at the same time from the same point (both can make it in a single turn) would they get there at the same time for combat/mine sweeping purposes?
I believe that combat occurs 6 times, but not sure how the movement relates to that with different movements. And when does mine sweeping/detonation occur within this breakdown.
The main reason I am asking is for multiplayer coordination with joint attacks and the like, I would hate to send two fleets to a warp point protected by mines and have the mine sweeping fleet arrived second. I realise by possibly sending them seperately (different turns), or by starting from 1 sector away I might not have to worry about this, but playing against humans this would give the game away and prevent surprise attacks etc..

Any ideas?

Regards,
Griffin