sentences: km/hr is a kind of unit for representing speed
docs: unit_of_speed is unit_of_measure. units_of_time is seconds. per_unit_time is unit_of_rate. one_unit_of_time is minute. horsepower_hour is work_unit. kilometers_per_hour is rate. unit_of_velocity is unit_of_rate. unit_of_speed is kilometers_per_hour. unit_of_speed is unit_of_rate. unit_of_angular_speed is unit_of_rate.