#include <stdio.h>

int main (void)
{
  int k, K;
  int n, i;
  float v, s, M;
  float m[1001], t[1001], F[1001], tm[1001];

  FILE *in = fopen ("ame.in", "r");
  fscanf (in, "%d\n", &K);
  for (k = 1; k <= K; k ++)
    {
      fscanf (in, "%d %f\n", &n, &M);
      for (i = 0; i < n; i ++)
	fscanf (in, "%f %f %f\n", &m[i], &t[i], &F[i]);
      tm[n] = M;
      for (i = n-1; i >= 0; i --)
	tm[i] = tm[i+1] + m[i];
      v = 0.0; s = 0.0;
      for (i = 0; i < n; i ++)
	{
	  s += v*t[i] + 0.5*t[i]*t[i]*(F[i]/tm[i]-9.81);
	  v += t[i]*(F[i]/tm[i]-9.81);
	}
      printf ("Data Set %d:\n", k);
      printf ("%.2f\n", s);
    }
  fclose (in);
  return 0;
}