#include<bits/stdc++.h>
using namespace std;
#define int long long
#define F first
#define S second
#define all(x) x.begin(),x.end()
#define pii pair<int,int>
#define pb push_back
#define sz(x) (int)(x.size())
#define chmin(x,y) x=min(x,y)
#define chmax(x,y) x=max(x,y)
#define vi vector<int>
#define vp vector<pii>
#define vvi vector<vi>
#define ykh mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count())
#define __lg(x) 63-__builtin_clzll(x)
#define pow2(x) (1LL<<x)
void __print(int x) {cerr << x;}
void __print(float x) {cerr << x;}
void __print(double x) {cerr << x;}
void __print(long double x) {cerr << x;}
void __print(char x) {cerr << '\'' << x << '\'';}
void __print(const char *x) {cerr << '\"' << x << '\"';}
void __print(const string &x) {cerr << '\"' << x << '\"';}
void __print(bool x) {cerr << (x ? "true" : "false");}
template<typename T, typename V>
void __print(const pair<T, V> &x) {cerr << '{'; __print(x.first); cerr << ','; __print(x.second); cerr << '}';}
template<typename T>
void __print(const T &x) {int f = 0; cerr << '{'; for (auto &i: x) cerr << (f++ ? "," : ""), __print(i); cerr << "}";}
void _print() {cerr << "]\n";}
template <typename T, typename... V>
void _print(T t, V... v) {__print(t); if (sizeof...(v)) cerr << ", "; _print(v...);}
#ifdef local
void CHECK();
void setio(){
freopen("/Users/iantsai/cpp/input.txt","r",stdin);
freopen("/Users/iantsai/cpp/output.txt","w",stdout);
}
#define debug(x...) cerr << "[" << #x << "] = ["; _print(x)
#else
void setio(){}
#define debug(x...)
#endif
#define TOI_is_so_de ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);setio();
const int blk = 800, mxn = 1e5 + 5, inf = 1e18;
int c[mxn], tmr = 0, jump[20][mxn], sum[20][mxn], bid[mxn], cnt = 0, dis[mxn / blk][mxn];
vector<pii>v[mxn];
vector<int>id[mxn];
void solve(){
int n, t, q;
cin >> n >> t;
for(int i = 1; i < n; i++){
cin >> c[i];
for(int j = 1; j <= c[i]; j++){
int l, r;
cin >> l >> r;
v[i].pb({l, r});
}
sort(all(v[i]));
}
v[n].pb({0, 0});
for(int i = 1; i <= n; i++){
vector<pii>st;
for(auto [l, r] : v[i]){
while(sz(st) and st.back().S >= r){
st.pop_back();
}
st.pb({l, r});
}
for(int j = 0; j < sz(st); j++){
id[i].pb(++tmr);
}
v[i] = st;
}
for(int i = 1; i < n; i++){
for(int j = 0; j < sz(v[i]); j++){
if(v[i][j].S <= v[i + 1].back().F){
jump[0][id[i][j]] = lower_bound(all(v[i + 1]), make_pair(v[i][j].S, 0LL)) - v[i + 1].begin();
sum[0][id[i][j]] = v[i + 1][jump[0][id[i][j]]].F - v[i][j].F;
}
else{
jump[0][id[i][j]] = 0;
sum[0][id[i][j]] = v[i + 1][0].F + t - v[i][j].F;
}
}
}
for(int i = 1; i < 20; i++){
for(int j = 1; j < n; j++){
for(int k = 0; k < sz(v[j]); k++){
if(j + (1 << i) - 1 <= n){
int v = id[j + (1 << i - 1)][jump[i - 1][id[j][k]]];
jump[i][id[j][k]] = jump[i - 1][v];
sum[i][id[j][k]] = sum[i - 1][id[j][k]] + sum[i - 1][v];
}
}
}
}
for(int i = 1; i < n; i++){
if(sz(v[i]) < blk) continue;
bid[i] = ++cnt;
vector<int>dp(sz(v[i]), 0);
for(int j = i + 1; j <= n; j++){
dis[cnt][j] = inf;
vector<int>ndp(sz(v[j]), inf);
for(int k = 0; k < sz(v[j - 1]); k++){
chmin(dis[cnt][j], dp[k] + v[j - 1][k].S - v[j - 1][k].F);
chmin(ndp[jump[0][id[j - 1][k]]], dp[k] + sum[0][id[j - 1][k]]);
}
dp = ndp;
}
}
cin >> q;
while(q--){
int l, r, ans = inf;
cin >> l >> r;
auto qry = [&](int idx, int l, int r){
int dif = r - l - 1, res = 0, cur = l;
for(int i = 19; i >= 0; i--){
if(dif >> i & 1){
res += sum[i][id[cur][idx]];
idx = jump[i][id[cur][idx]];
cur = cur + (1 << i);
}
}
return res + v[r - 1][idx].S - v[r - 1][idx].F;
};
if(sz(v[l]) < blk){
for(int i = 0; i < sz(v[l]); i++){
chmin(ans, qry(i, l, r));
}
}
else{
ans = dis[bid[l]][r];
}
cout << ans << '\n';
}
}
signed main(){
TOI_is_so_de;
int t = 1;
//cin >> t;
while(t--){
solve();
}
#ifdef local
CHECK();
#endif
}
/*
input:
*/
#ifdef local
void CHECK(){
cerr << "\n[Time]: " << 1000.0 * clock() / CLOCKS_PER_SEC << " ms.\n";
function<bool(string,string)> compareFiles = [](string p1, string p2)->bool {
std::ifstream file1(p1);
std::ifstream file2(p2);
if(!file1.is_open() || !file2.is_open()) return false;
std::string line1, line2;
while (getline(file1, line1) && getline(file2, line2)) {
if (line1 != line2)return false;
}
int cnta = 0, cntb = 0;
while(getline(file1,line1))cnta++;
while(getline(file2,line2))cntb++;
return cntb - cnta <= 1;
};
bool check = compareFiles("output.txt","expected.txt");
if(check) cerr<<"ACCEPTED\n";
else cerr<<"WRONG ANSWER!\n";
}
#else
#endif
