#include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     int t;     cin >> t;     int n, x;     while (t--) {       cin >> n >> x;       if (n == 1 || n == 2)         cout << 1 << endl;       else {         if ((n - 2) % x == 0)           cout << (n - 2) / x + 1 << endl;         else           cout << (n - 2) / x + 2 << endl;       }     }   }   