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.
