HYROX Doubles is the two-person division. Both partners run every 1 km together, then share the work at each station, splitting the reps however they like. It keeps the full race distance but halves each person's station workload, which makes it a popular, lower-pressure way to race your first HYROX.
This is a direct answer from the CrossFit BC coaching team. Short version first, then the detail and the local context for training in Vancouver. If you want the same answer applied to your own situation, a coach will walk through it with you in person.
Yes. Both partners run every 1 km leg together, so the full running distance is the same as a solo race. Only the station reps are shared between you.
However you choose. Partners divide the total reps at each station in any split that works, so you can play to each person's strengths as long as the reps get done.
Yes. It keeps the full race experience while halving each person's station load, and racing alongside a partner makes a first HYROX far less intimidating.