These problems focus on the application of metric measurement conversion and map scale representation. The tasks involve calculating map distances when an actual distance is given, using different map scales (e.g., 1:90, 1:30, 1:6000). Students are required to convert between metric units (millimeters, centimeters, meters, decameters) while applying a scale ratio to find equivalent measurements on a map, such as converting centimeters to millimeters or meters to centimeters based on the map scale provided. Additionally, the exercises include multiple-choice answers to assess the understanding of metric conversions and proportional reasoning in a mapping context.