Java 代码

/**4 MDKJ
"Ad astra per aspera" - The motto of Kansas
*/

import java.util.Scanner;

public class Main
{
    public static void main (String[] args)
    {
        Scanner cin = new Scanner(System.in);
        System.out.println (String.format("%.3f", cin.nextInt() / cin.nextDouble()) + " km/l");
    }
}