#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return true; } return false; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return true; } return false; }
#define all(x) (x).begin(),(x).end()
#define fi first
#define se second
#define mp make_pair
#define si(x) int(x.size())
const int mod=998244353,MAX=300005,INF=1<<30;

int main(){
    
    std::ifstream in("text.txt");
    std::cin.rdbuf(in.rdbuf());
    cin.tie(0);
    ios::sync_with_stdio(false);
    
    int Q;cin>>Q;
    while(Q--){
        ll N,M;cin>>N>>M;
        vector<double> tim(N);
        vector<ll> needat(N);
        
        for(int i=0;i<N;i++){
            ll l,r,h,s;cin>>l>>r>>h>>s;
            l-=6;
            chmax(l,0LL);
            tim[N-1-i]=(double)(l)/5.25;
            needat[N-1-i]=(h+s+23)/24;
        }
        
        //for(int i=0;i<N;i++) cout<<tim[i]<<" "<<needat[i]<<endl;
        
        double left=tim[0]+0.89,right=2e12;
        for(int q=0;q<80;q++){
            double mid=(left+right)/2;
            ll rem=M,hozi=0;
            
            for(int i=0;i<N;i++){
                if(hozi>=needat[i]){
                    hozi-=needat[i];
                }else{
                    ll can=floor((mid-tim[i])/0.89);
                    if(can==0) can=1;
                    ll X=(needat[i]-hozi+can-1)/can;
                    rem-=X;
                    hozi+=can*X;
                    hozi-=needat[i];
                    
                    //cout<<mid<<" "<<can<<" "<<hozi<<" "<<rem<<endl;
                }
                if(rem<0) break;
            }
            
            if(rem>=0){
                right=mid;
            }else{
                left=mid;
            }
        }
        
        cout<<fixed<<setprecision(25)<<right<<endl;
    }
    
}