Queue tree priority and limits

RouterOS General
1

  1. If several queues have parent global, does prioritization work between them ?

  2. If one of queues doesn’t have limit(s), how much will it get relative to others (with limits and priorities) ?
    for example:

queue1 parent=global limit-at=1M max-limit=10M priority=3
queue2 parent=global limit-at=2M max-limit=20M priority=5
queue3 parent=global
  1. As it’s said the limits for children must be set, taking into account parent limits, but what are they for the global ?