Wrong Speed in the Location Sensor

Hi everyone, will anyone know why the location sensor reports a wrong speed? I have designed different ways to report speed and tested on different smartphones and they all do the same speed report. For example, comparing the speed supports with my app and another google play app and the speed of my car, my app reports a speed of up to 50% difference from the others. I have checked it in km / hr and miles / hr. thank you very much to all

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Location sensor reports a speed in m/s.
m/s * 3,6 = km/h