// Repraesentiert einen Eintrag im Lauftagebuch
class Entry{
    Date d;
    double distance; // in km
    int duration;    // in min
    String comment; 


    // requires duration != 0
    Entry(Date d, double distance, int duration, String comment) {
        this.d = d;
        this.distance = distance;
        this.duration = duration;
        this.comment = comment;
    }

    // Durchschnittsgeschwindigkeit in km/h
    double calculateSpeed() {
        double h = duration / 60.0; 
        return distance / h;
    }

    public String toString() {
        return 
            this.d.toString() + " " + this.distance + " km " + " in " + this.duration + " min; " + this.comment;
    }

}