#include <iostream>
#include <string>
#include <set>
#include <map>
#include <algorithm>
#include <iomanip>
#include <vector>
#include <cmath>
#include <queue>
#include <sstream>
#include <ctime>
#include <iterator>
#include <string.h>
#include <stack>
#include <unordered_set>
#include <unordered_map>
#include <bitset>
#include <fstream>
#include <assert.h>
#include <numeric>
#include <complex>
#include <random>
#include <utility>

using namespace std;

int main() {
    int i;
    cin >> i;
    while(i--){
        long double n, p1, v1, p2, v2 ;
        cin >> n >> p1 >> v1 >> p2 >> v2;
        if(p1>p2) {
            swap(v1,v2);
            swap(p1,p2);
        }
        long double ans1, ans2, ans3, ans4, ans5, ans6, ans7;
        ans1 = (n + min(p1, n-p1))/v1;
        ans2 = (n + min(p2, n-p2))/v2;
        ans3 = (n + p1 + n - p2)/(v1+v2);
        ans4 = (n + p2 + n - p1)/(v1+v2);
        ans5 = max((p2-p1 + p2)/v1, (n-p2)/v2 );
        ans6 = max((p2-p1 + p1)/v2, p1/v1 );
        ans7 = max((n-p1)/v1, p2/v2 );
        cout << fixed << setprecision(10) << min({ans1, ans2, ans3, ans4, ans5, ans6, ans7}) << endl;
    }
    return 0;
}