#include <fstream>
#include <string>
#include <math.h>
ifstream in("average.in");

int main()
{
  int n;
  in>>n;
  double d;
  in>>d;
  int nr;
  while(in>>nr)
    {
      int h, m, s;
      h=0; m=0; s=0;
      int disq=0;
      for (int i=0; i<n; i++)
	{
	  int dh, dm, ds;
	  in>>ws;
	  if (in.peek()=='-')
	    {
	      string str;
	      disq=1;
	      in>>str;
	    }
	  else
	    {
	      char c;
	      in>>dh>>c>>dm>>c>>ds;
	      h+=dh; 
	      m+=dm;
	      s+=ds;
	    }
	}
      double sectot=double(s)+60.*(double(m)+60.*double(h));
      double avg = sectot/d;
      double delta = avg-floor(avg); 
      int ressec;
      if (delta>0.5) ressec=int(floor(avg))+1;
      else
	ressec=int(floor(avg));
      cout.fill(' ');
      cout.width(3);
      cout<<nr<<": ";
      if (disq) cout<<'-'<<endl;
      else
	{
	  cout.precision(0);
	  cout.setf(ios::fixed, ios::floatfield);
	  
	  cout<<ressec/60<<':';
	  cout.width(2);
	  cout.fill('0');
	  cout<<ressec%60<<" min/km"<<endl;
	}
    }
  return 0;
}