#include <iostream>
#include <fstream>
#include <cmath>

using namespace std;

struct stage{
	double m, t, F;
};

int main(){
	ifstream is("ame.in");

	stage stages[60];

	if(!is){
		cerr << "Could not open" << endl;
		return 1;
	}

	int K;
	is >> K;

	for(int i=0; i < K; i++){
		int n;
		double height = 0.0,
			currVel = 0.0,
			weight;
		is >> n;
		is >> weight;

		for(int x = 0; x < n; x++){
			is >> stages[x].m;
			is >> stages[x].t;
			is >> stages[x].F;
			weight += stages[x].m;
		}

		for(int x = 0; x < n; x++){
			double a = stages[x].F/weight - 9.81;

			height += currVel * stages[x].t + 0.5 * 
				stages[x].t * stages[x].t * a;
			currVel += a * stages[x].t;

			weight -= stages[x].m;
		}

		printf("Data Set %d:\n", i+1);
		printf("%.2f\n", height);
	}

	return 0;
}