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I imported osm.pbf data into postgis using osm2po. The table I obtained (at_2po_4pgr) includes cost data. I would like to know how these costs have been calculated. thank you

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public static double calcDistanceSphere(
        double lat1, double lon1, double lat2, double lon2) {
    // see:
    double d = StrictMath.acos(StrictMath.sin(lat1 * RAD_PI) * StrictMath.sin(lat2 * RAD_PI)
            + StrictMath.cos(lat1 * RAD_PI)* StrictMath.cos(lat2 * RAD_PI)
            * StrictMath.cos((lon2-lon1) * RAD_PI))
            * RADIUS_EARTH_KM;
    if (Double.isNaN(d)) return 0;
    return d;

[km] = distanceSphere

cost[h] = [km] / [kmh]
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