kilometers km are a metric unit used for measuring length / distance generally used for values between 1 and 50000000
kilometer is not one_type_of_unit. kilometer is one_type_of_unit. kilometers is part_of_metric_system. kilometers_per_hour is rate. unit_of_speed is kilometers_per_hour. kilometers is not metric_unit_of_distance. kilometer is not metric_linear_unit. kilometers is not part_of_metric_system. kilometers is metric_unit_of_distance. kilometer is metric_linear_unit.