Millimeters per day (mm/day)
Millimeters per day (mm/day) is a unit of speed and this unit is the number of millimeters travelled in one day.
Miles per hour (mph, mi/h)
Miles per hour (mph or mi/h) is a unit of speed. Mph is a unit commonly used to express the speed of vehicles, such as cars and trains in countries that have traditionally used the imperial system such as the United States and United Kingdom.