<Li> meter per hour (​ ⁄), a measure of slow speeds </Li> <Li> mile per hour (mph), a measure of land speed </Li> <Li> passengers per hour per direction (p / h / d), a measure of the capacity of public transportation systems </Li> <Li> pound per hour (PPH), a measure of mass flow used for engines' fuel flow </Li>

Why is the day divided into 24 hours