Furlongs per acre.
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The SI derived unit for speed is meter per second, m/s. The English standard unit for speed is feet per second, ft/s.
The dimensions of speed are distance/time. Any unit of linear distance and any unit of time may be used.
r=d/t is farmula of speed or uniform speed and its si unit is m/s.
Distance travelled per unit time .
An hour is a unit of time. A mile is a unit of distance. Without some unit of speed to compare, the two units are incompatible.