public void AddJourney(Journey j)
{
KilometersTraveled += j.KilometersTraveled;
KilometersTraveledSinceService += j.KilometersTraveled;
}
public void AddJourney(Journey j)
{
KilometersTraveled += j.KilometersTraveled;
TotalServices = ServicesDone(KilometersTraveled);
}