Average speed in kilometers

The problem

Assume a runner runs 24 miles in 1 hour, 40 minutes, and 35 seconds. In this instance, write a program that displays the average speed in kilometers per hour. (Note that 1 mile is 1.6 kilometers.)

Breaking it down

private static double HOURS = 1;
private static double MINUTES = 40;
private static double SECONDS = 35;
private static double DISTANCE_IN_MILES = 24;

public static void main(String[] strings) {

    double distanceInKilometers = DISTANCE_IN_MILES * 1.6;

    double timeInMinutes = convertToTimeInMinutes(HOURS, MINUTES, SECONDS);

    double kilometersPerHour = kiloMetersPerHour(distanceInKilometers,
            timeInMinutes);

    System.out.println(kilometersPerHour);

}

private static double kiloMetersPerHour(double distanceInKilometers,
        double timeInMinutes) {
    double kilometersPerHour = 60.0 * distanceInKilometers / timeInMinutes;
    return kilometersPerHour;
}

private static double convertToTimeInMinutes(double hours, double minutes,
        double seconds) {
    double timeInMinutes = (hours * 60.0) + minutes + (seconds / 60.0);
    return timeInMinutes;
}

Output

22.906379453189732