#include <bits/stdc++.h>
using namespace std;
const int maxn = 101010;
const int maxB = 350;
struct node {
  int L, R, T, id;
  int operator<(const node &o) const { return T < o.T; }
};
int id[maxn], ans[maxB][maxn];
int lo[maxB], hi[maxB], ok[maxn];
long long a[maxn], b[maxn];
node ask[maxn];
int n, m, size, tot;
vector<pair<pair<int, int>, int> > T;
int haha[maxn];
int main() {
  scanf("%d%d", &n, &m);
  for (int i = 1; i <= n; i++) {
    int x, y;
    scanf("%d%d", &x, &y);
    a[i] = x, b[i] = y;
  }
  size = (int)sqrt(n);
  tot = 0;
  for (int i = 1; i <= n; i++)
    if (!tot || i - lo[tot] == size) {
      hi[tot] = i - 1;
      tot++;
      lo[tot] = i;
      id[i] = tot;
    } else
      id[i] = tot;
  hi[tot] = n;
  for (int i = 1; i <= m; i++)
    scanf("%d%d%d", &ask[i].L, &ask[i].R, &ask[i].T), ask[i].id = i;
  sort(ask + 1, ask + 1 + m);
  for (int lp = 1; lp <= tot; lp++) {
    T.clear();
    for (int i = lo[lp]; i <= hi[lp]; i++) {
      int x = 0, y = 1000000;
      for (int j = lo[lp]; j <= hi[lp]; j++)
        if (i - j) {
          if ((a[i] < a[j] || a[i] == a[j] && i > j) && b[i] <= b[j]) {
            x = 1, y = 0;
            break;
          }
          if ((a[i] > a[j] || a[i] == a[j] && i < j) && b[i] >= b[j]) continue;
          double k1 = b[i], k2 = b[j], b1 = a[i], b2 = a[j];
          int curL, curR;
          long long z;
          if (b[i] > b[j]) {
            z = (long long)ceil((b1 - b2) / (k2 - k1));
            if (z > 1000000LL) continue;
            if (a[i] + b[i] * z == a[j] + b[j] * z && i > j) z++;
            curL = (int)z, curR = 1000000;
          } else {
            z = (long long)floor((b1 - b2) / (k2 - k1));
            if (z > 1000000LL) z = 1000000LL;
            if (a[i] + b[i] * z == a[j] + b[j] * z && i > j) z--;
            curL = 0, curR = (int)z;
          }
          x = max(x, curL);
          y = min(y, curR);
        }
      if (x <= y) T.push_back(make_pair(make_pair(x, y), i));
    }
    sort(T.begin(), T.end());
    int cur = 0;
    for (int i = 1; i <= m; i++) {
      for (;;) {
        if (T[cur].first.first <= ask[i].T && ask[i].T <= T[cur].first.second)
          break;
        cur++;
      }
      ans[lp][i] = T[cur].second;
    }
  }
  for (int i = 1; i <= m; i++) {
    int L = ask[i].L, R = ask[i].R;
    long long T = (long long)ask[i].T;
    int x, y, w = ask[i].id;
    ok[w] = L;
    for (int j = L; j <= R; j++) {
      if (lo[id[j]] == j) break;
      if (a[j] + b[j] * T > a[ok[w]] + b[ok[w]] * T) ok[w] = j;
    }
    for (int j = R; j >= L; j--) {
      if (hi[id[j]] == j) break;
      if (a[j] + b[j] * T > a[ok[w]] + b[ok[w]] * T) ok[w] = j;
    }
    x = y = -1;
    for (int j = L; j <= n; j++)
      if (lo[id[j]] == j) {
        x = id[j];
        break;
      }
    for (int j = R; j; j--)
      if (hi[id[j]] == j) {
        y = id[j];
        break;
      }
    if (x == -1 || y == -1 || x > y) continue;
    for (int j = x; j <= y; j++) {
      int g = ans[j][i];
      if (a[g] + b[g] * T > a[ok[w]] + b[ok[w]] * T) ok[w] = g;
    }
  }
  for (int i = 1; i <= m; i++) {
    int w = ask[i].id;
    haha[w] = a[ok[w]] + b[ok[w]] * ask[i].T;
  }
  for (int i = 1; i <= m; i++) printf("%d\n", ok[i]);
  return 0;
}
