没那么多追求，能过就行

import java.util.*;

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] lastT = new int[3];
        double v = 0;
        double s = 0;
        String str = sc.nextLine();
        char[] chs = str.toCharArray();
        for (int i = 0,n = 0; i < chs.length; i++){
            if(i < 8){
                if(chs[i] == ':'){
                    n++;
                    continue;
                }
                lastT[n] = chs[i]-'0'+lastT[n]*10;

            }else {
                if(chs[i] >='0' && chs[i] <= '9'){
                    v = v*10 + chs[i]-'0';

                }
            }
        }

        
        while(sc.hasNext()){
            str = sc.nextLine();
            chs = str.toCharArray();
            double nv = 0;
            boolean flag = true;
            int[] time = new int[3];
            for (int i = 0,n = 0; i < chs.length; i++){
                if(i < 8){
                    if(chs[i] == ':'){
                        n++;
                        continue;
                    }
                    time[n] = chs[i]-'0'+time[n]*10;

                }else {
                    if(flag){
                        flag = false;
                    }
                    if(chs[i] >='0' && chs[i] <= '9'){
                        nv = nv*10 + chs[i]-'0';

                    }
                }
            }
            double dt = (time[0]-lastT[0])+ (double) (time[1] - lastT[1]) /60+(double) (time[2] - lastT[2]) /3600;
            s = s + v * dt;
            if(!flag){
                v = nv;

            }else System.out.printf(str+" %.2f km\n",s);
            lastT[0] = time[0];
            lastT[1] = time[1];
            lastT[2] = time[2];
        }
    }
}