#include <bits/stdc++.h>
using namespace std;
long double check(int64_t r, int64_t v, int64_t a, int64_t b, int64_t mod) {
  long double A, B;
  if (v == 0) {
    if (a < r && r < b)
      A = 0, B = 1e9;
    else
      A = -1, B = -1;
  } else {
    A = 1. * (a - r) / v;
    B = 1. * (b - r) / v;
  }
  if (mod)
    return max(A, B);
  else
    return min(A, B);
}
const long double eps = 1e-12;
signed main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  int64_t n;
  cin >> n;
  long double mn = 0, mx = 1e12;
  int64_t x1, y1, x2, y2;
  if (x1 == x2 || y1 == y2) {
    cout << -1 << endl;
    return 0;
  }
  cin >> x1 >> y1 >> x2 >> y2;
  for (int64_t i = 0; i < n; i++) {
    int64_t rx, ry, vx, vy;
    cin >> rx >> ry >> vx >> vy;
    mn = max(mn, check(rx, vx, x1, x2, 0));
    mn = max(mn, check(ry, vy, y1, y2, 0));
    mx = min(mx, check(rx, vx, x1, x2, 1));
    mx = min(mx, check(ry, vy, y1, y2, 1));
  }
  if (mx - mn <= eps)
    cout << -1 << endl;
  else
    cout << fixed << setprecision(8) << mn << endl;
  return 0;
}
