On your odometer, you would see two markings in this manner, the outer marking could be in MPH, and the inner marking could be in KM/H or vice versa.
If on the odometer, your outer markings which are more prominent are in MPH, it means your car calculates its distance in miles on the trip metre. But,
If the outer markings which are more prominent on the odometer are in KM/H, it means your car calculates its distance in km on the trip metre.
That said, note that the odometer of vehicles in or from the USA are calibrated in miles.
If on the odometer, your outer markings which are more prominent are in MPH, it means your car calculates its distance in miles on the trip metre. But,
If the outer markings which are more prominent on the odometer are in KM/H, it means your car calculates its distance in km on the trip metre.
That said, note that the odometer of vehicles in or from the USA are calibrated in miles.