/ Rope for glacier travel
Well you wouldn't want less than 50m, so you could be (roughly, obviously the knots take up some rope), 10 m apart.
But why would you worry excessively about getting the lightest and shortest rope possible? That matters a lot for a party of 2, but diluted among 5? Any 9mm or 10mm should do the trick, you could go to a smaller diameter if you wanted, but why bother (apart from the fact that the rope has to be carried by one person when NOT on the glacier).
for 5 - a 60m rope would work well as it gives a bit omre of a gap - 12m eahc (less knots) - Beal Joker? 9mm, full rope. Good for cragging etc too.
As others have said it is a minor issue between 5 but carrying to/from would be onerous - split other kit (aves, 'pons etc) though and it ought to work out fine.
If I were in the OP's position and thinking about cragging use afterwards, I might buy a 50m Beal Cobra (not in theory a single rope, but would do fine for glacier travel). But then I did climb the Dent d'Herrens with 30m of 8mm walker's confidence rope!
Would also agree. Less faff, plus if somebody in the group of three did fall in a crevasse then you have two people already freed from the rope who will be able to assist quicker/easier.
For pure glacier travel, I would far rather be on a rope of 5 than a rope of 2.
Personally, I am quite happy travelling on a glacier with one half rope. If, however, you want the reassurance of a single rope then the Mammut Serenity 8.9mm is also dry treated and is the thinnest single rope available.
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