int main (int argc, char **argv)
{
	struct stat sb;
	if (argc !=3 ) exit(EXIT_FAILURE);
	char c[]="                                                      ";
	time_t t;
	stat(argv[1],&sb);
	long a=(long)time(&t);
	strcat(c,"cp ");
	strcat(c,argv[1]);
	strcat(c," ");
	strcat(c,argv[2]);
	system(c);
	printf("Time: %f\n",(double)sb.st_size/1024/1024/((double)time(&t)-a));
	exit(EXIT_SUCCESS);
	}