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The teenage trio of Cecilia Crooks, Ella Harris and Georgia Mitchell - racing under the name No Sweat - won the teams' half race in 4hr 41min 58sec, finishing
eight minutes ahead of the second-placed Hot On Ya Heels team.
Crooks and Mitchell attend St Hilda's Collegiate. Harris is a former Columba College pupil.
The group beat out 57 other teams in the open-age race.
Crooks got the team off to a good start, emerging from the 1.9km swim in 24min 26sec.
Harris then opened up a handy lead on the bike leg, completing the 90km ride in 2hr 33min 56sec.
That lead grew when Mitchell took off for her run and finished the 21.1km course - a half-marathon - in 1hr 38min 50sec.