One sure way to do it is shift one of the slow ships to the faster fleet. Both will move at the same speed then. This is not an ideal solution, but if you have time to make the shift it works perfectly.
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I've seen this in a previous thread regarding minesweeping in various fleets... What was the consensus?
If I remember correctly it was something like:
put all the minesweepers together (i.e. combine the fleets) before unleashing each fleet separately otherwise you run the risk of a single 'sweeper being overwhelmed while fleet A gets annihilated. Fleet B comes in and the 'sweepers here have a less busy day. If both A + B's mine sweepers had been together initially, a substantial portion of both fleets would have survived.
Basically correct, Wildcard. Minesweeping happens DURING movement, while each individual fleet moves. Combat happens after each movement "day" of the turn.
So if you syncronize fleet movments (by hoping that shift+click actually works or by mixing ships in a way that fleets have same speed), you have no problems combatwise. For minesweeping, it is difficult or impossible to determine which fleet will move first each day.