SpeedConverter

public class SpeedConverter {

    public static long toMilesPerHour(double kilometersPerHour){

        if(kilometersPerHour < 0){

            return -1;

        }

            else {

            return Math.round(kilometersPerHour / 1.609);

            }

    }



    public static void printConversion(double kilometersPerHour) {

        int miles = (int) Math.round(kilometersPerHour / 1.609);

        if (kilometersPerHour < 0) {

            System.out.println("Invalid Value");

        } else {

            System.out.println(kilometersPerHour + " km/h " + "= " + miles + " mi/h");

        }

    }



}