public class Journey
{
  private double start, finish, litres;

  public void setStart (double s)
    {
      start = s;
    }

  public void setFinish (double f)
    {
      finish = f;
    }

  public void setLitres (double l)
    {
      litres = l;
    }

  public double consumption ()
    {
      // total distance traveled
      double distance = finish - start;

      // litres used per kilometre
      double literPerKilo = litres / distance;	

      return literPerKilo * 100;
    }

  public String toString ()
    {
      return 
        "Journey start " + start + 
        " finish " + finish + 
        " litres " + litres + 
        " consumption (per 100km) " + consumption ();
    } 

} // end of class Journey