#include <bits/stdc++.h>

using namespace std;
#define SEND
#define ld long double
#define pb push_back
#define f first
#define s second
mt19937 rnd(chrono::high_resolution_clock::now().time_since_epoch().count());

struct point {
    ld x, y, k;
};

ld get_k(ld x1, ld y1, ld x2, ld y2) {
    if (x1 == x2)return 0;
    return (y1 - y2) / (x1 - x2);
}

signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
#ifdef SEND
    freopen("mountain.in", "r", stdin);
    freopen("mountain.out", "w", stdout);
#endif
    int n, q;
    cin >> n >> q;
    point p[n + 1];
    ld a = 0, b = 0;
    for (int i = 0; i < n; ++i) {
        ld d, k;
        cin >> d >> k;
        p[i] = {a, b, k};
        a += d;
        b += d * k;
    }
    p[n] = {a, b, 0};
    while (q--) {
        ld x, y;
        cin >> x >> y;
        int pos = 0;
        for (int i = 0; i < n + 1; ++i) {
            if (p[i].x <= x)pos = i;
        }
        int pos1 = pos;
        if (pos1 < n)pos1++;
        pos--;
        while (pos >= 0 && get_k(p[pos].x, p[pos].y, x, y) >= p[pos].k) {
            pos--;
        }
        ld ans1 = p[pos + 1].x;
        while (pos1 < n && get_k(p[pos1].x, p[pos1].y, x, y) <= p[pos1].k) {
            pos1++;
        }
        ld ans2 = p[pos1].x;
        cout << ans1 << " " << ans2 << endl;
    }
    return 0;
}