#include <bits/stdc++.h>
using namespace std;
#define int long long
#define ld long double
#define show(x,y) cout << y << " " << #x << endl;
#define show2(x,y,i,j) cout << y << " " << #x << " " << j << " " << #i << endl;
#define show3(x,y,i,j,p,q) cout << y << " " << #x << " " << j << " " << #i << " " << q << " " << #p << endl;
#define show4(x,y) for(auto it:y) cout << it << " "; cout << #x << endl;
typedef pair<int,int>pii;
typedef pair<int,pii>pi2;
mt19937_64 rng(chrono::system_clock::now().time_since_epoch().count());
int two[22][100005];
int dp[22][100005];
int offset[100005];
vector<pii>adj[100005];
const int blk=-1;
void solve(){
int n,k;
cin >> n >> k;
pii arr[n+5];
for(int x=1;x<n;x++){
cin >> arr[x].first >> arr[x].first >> arr[x].second;
}
int q;
cin >> q;
int l,r;
for(int x=0;x<q;x++){
cin >> l >> r;
int counter=arr[l].second-arr[l].first;
int cur=arr[l].second;
for(int y=l+1;y<r;y++){
if(arr[y].first<cur){
counter+=k;
counter+=(arr[y].second-cur);
}
else counter+=(arr[y].second-cur);
cur=arr[y].second;
}
cout << counter << "\n";
}
}
int32_t main(){
ios::sync_with_stdio(0);
cin.tie(0);
//freopen("in.txt","r",stdin);
//freopen("out.txt","w",stdout);
int t=1;
//cin >> t;
while(t--){
solve();
}
}
