What are the sizes and GPM ratings of the two cross-lays?

The correct choice indicates that the sizes of the two cross-lays are 1 3/4 inches with a flow of 150 gallons per minute (GPM) and 2 1/2 inches with a flow of 250 GPM. This configuration is commonly used in firefighting because it provides a good balance between size and flow capability. The 1 3/4-inch line is adequate for many standard firefighting situations, allowing for maneuverability and ease of handling while delivering a sufficient flow rate for most structure fires and brush fires.

In contrast, the 2 1/2-inch line offers a higher flow rate, which is beneficial when facing larger fires or when more water is needed to suppress flames quickly. The specified GPM ratings correspond to the typical operational standards and practices in the field, where different line sizes are utilized to meet varying demands based on the nature of the emergency.

Understanding these specifications is crucial for firefighters to effectively deploy resources based on the size of the fire, the location, and the equipment being used.