The oxygen system on the CRJ 550 delivers oxygen for how many minutes?

The oxygen system on the CRJ 550 is designed to provide supplemental oxygen in the event of decompression to assist the crew and passengers. Specifically, it delivers oxygen for a duration of approximately 13 minutes. This time frame is critical, as it allows flight crews to navigate safely to a lower altitude where normal cabin pressure can be maintained.

This duration is based on the operational requirements set forth by aviation safety standards and is intended to be sufficient for emergency scenarios. The other options, while indicating potentially reasonable times for various breathing systems, do not align with the specific design and function of the CRJ 550's oxygen system. Thus, the 13-minute delivery ensures that in emergencies, there is adequate time for corrective actions to be taken.