#include <iostream>

using namespace std;

int main()
{
    int n, m;
    cin >> n >> m;

    while(n--){
        int a, b, c, d;
        cin >> a >> b >> c >> d;

        int egy = 24*a + b, ket = 24*c + d;

        int kul = ket - egy - 1;

        cout << kul / m << "\n";
    }
}