Miles per hour is a unit of speed, expressing the number of international miles covered per hour. The preferred SI unit for velocity is m/s, although km/h is often used as a replacement for mph.
... in the town. The population density is 1,322.5/km² (3,428.5/mi²). There are 4,661 housing units at an average density of 437.9/km² (1,135.1/mi²). ...