Final answer:
The non-standard unit for speed among the provided options is 'MS'. Standard units for speed include km/h, m/s, and mph.
Step-by-step explanation:
Among the options provided, 'MS' is not a standard measurement for speed. Units like kilometers per hour (km/h), meters per second (m/s), and miles per hour (mph) are all standard units used to express speed. The unit 'S/M' listed could be a typo, but if it were to stand for seconds per meter, it still would not be a unit of speed because speed is typically described by the distance traveled per unit of time, not the time per unit of distance. Therefore, speeds are correctly measured in units like meters per second (m/s) when dividing distance by time.