using System;

public class Program

{

    public static double[] FillData(int n)

    {

        double[] data = new double[n];

​

        for (int i = 0; i < n; i++)

        {

            Console.Write("Enter data: ");

            data[i] = double.Parse(Console.ReadLine());

        }

​

        return data;

    }

​

    public static double AverageKMpH(double[] city)

    {

        double averageSpeedMeterPerSecond = 0.0;

        for (int i = 0; i < city.Length; i++)

        {

            averageSpeedMeterPerSecond = averageSpeedMeterPerSecond + city[i];

        }

​

        averageSpeedMeterPerSecond = averageSpeedMeterPerSecond / city.Length;

​

        double averageSpeedKmPerHour = averageSpeedMeterPerSecond * 3.6;

        return averageSpeedKmPerHour;

    }

​

    public static void Main()

    {

        const int N = 14;

​

        double[] A = FillData(N);

        double[] B = FillData(N);

        double[] C = FillData(N);

​

        double averageKMpHCityA = AverageKMpH(A);

        double averageKMpHCityB = AverageKMpH(B);

        double averageKMpHCityC = AverageKMpH(C);

​

        Console.WriteLine($"City A average kilometers per hour: {averageKMpHCityA}");

        Console.WriteLine($"City B average kilometers per hour: {averageKMpHCityB}");

        Console.WriteLine($"City C average kilometers per hour: {averageKMpHCityC}");

    }

}

​