In what ways did cities attempt to solve the problems of crime and fire?

Cities outlawed gas lighting and required workers to travel to work during daytime hours.

Cities allowed immigrants to sleep in police and fire station houses.

Cities organized neighborhood gangs to support uniformed city employees.

Cities developed professional firefighting and police forces.

To solve the problems of crime and fire cities developed professional firefighting and police forces.

Explanation:

To solve the crime rates the cities developed professional police, by providing better training, ammunition, equipment and wages for the police.

To solve fire problems, firefighting forces are developed. By hiring effective workforce like firefighters, armed forces and other institutions.

Police force (cops) and firefighters are exclusively hired and trained to serve the public in every required or emergency situations.