import std.conv, std.functional, std.range, std.stdio, std.string;
import std.algorithm, std.array, std.bigint, std.bitmanip, std.complex, std.container, std.math, std.mathspecial, std.numeric, std.regex, std.typecons;
import core.bitop;

class EOFException : Throwable { this() { super("EOF"); } }
string[] tokens;
string readToken() { for (; tokens.empty; ) { if (stdin.eof) { throw new EOFException; } tokens = readln.split; } auto token = tokens.front; tokens.popFront; return token; }
int readInt() { return readToken.to!int; }
long readLong() { return readToken.to!long; }
real readReal() { return readToken.to!real; }

bool chmin(T)(ref T t, in T f) { if (t > f) { t = f; return true; } else { return false; } }
bool chmax(T)(ref T t, in T f) { if (t < f) { t = f; return true; } else { return false; } }

int binarySearch(alias pred, T)(in T[] as) { int lo = -1, hi = cast(int)(as.length); for (; lo + 1 < hi; ) { const mid = (lo + hi) >> 1; (unaryFun!pred(as[mid]) ? hi : lo) = mid; } return hi; }
int lowerBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a >= val)); }
int upperBound(T)(in T[] as, T val) { return as.binarySearch!(a => (a > val)); }


int N;
int[] A, B;
long[] C;

int[][] G;
int[] par, dep;
long[] dist;

void dfs(int u, int p, int ip) {
  par[u] = p;
  dep[u] = (p == -1) ? 0 : (dep[p] + 1);
  dist[u] = (p == -1) ? 0 : (dist[p] + C[ip]);
  foreach (i; G[u]) {
    const v = A[i] ^ B[i] ^ u;
    if (v != p) {
      dfs(v, u, i);
    }
  }
}

enum E = 17;
enum INF = 10L^^18;

struct Info {
  int last;
  long mn;
  long[2] xs;
};
Info mul(in Info f, in Info g) {
  Info h;
  h.last = g.last;
  h.mn = min(f.mn,
             (g.xs[0] != dist[f.last] - dist[par[f.last]]) ? g.xs[0] : g.xs[1],
             g.mn);
  h.xs = f.xs;
  return h;
}

void main() {
  try {
    for (; ; ) {
      N = readInt();
      A = new int[N - 1];
      B = new int[N - 1];
      C = new long[N - 1];
      foreach (i; 0 .. N - 1) {
        A[i] = readInt() - 1;
        B[i] = readInt() - 1;
        C[i] = readLong();
      }
      const Q = readInt();
      auto X = new int[Q];
      auto Y = new int[Q];
      foreach (q; 0 .. Q) {
        X[q] = readInt() - 1;
        Y[q] = readInt() - 1;
      }
      
      G = new int[][N];
      foreach (i; 0 .. N - 1) {
        G[A[i]] ~= i;
        G[B[i]] ~= i;
      }
      par = new int[N];
      dep = new int[N];
      dist = new long[N];
      dfs(0, -1, -1);
      auto dd = new Info[][](E, N);
      foreach (u; 0 .. N) {
        dd[0][u].last = u;
        dd[0][u].mn = INF;
        dd[0][u].xs[] = INF;
        foreach (i; G[u]) {
          const v = A[i] ^ B[i] ^ u;
          if (v != par[u]) {
            long tmp = C[i];
            foreach (k; 0 .. 2) {
              if (dd[0][u].xs[k] > tmp) {
                swap(dd[0][u].xs[k], tmp);
              }
            }
          }
        }
      }
      foreach (e; 0 .. E - 1) {
        foreach (u; 0 .. N) {
          const l = dd[e][u].last;
          if (l == -1 || par[l] == -1) {
            dd[e + 1][u] = dd[e][u];
          } else {
            dd[e + 1][u] = mul(dd[e][u], dd[e][par[l]]);
          }
        }
      }
      debug {
        foreach (e; 0 .. E - 1) {
          writefln("dd[%s] = %s", e, dd[e]);
        }
      }
      
      auto mns = new long[][](N, 3);
      foreach (u; 0 .. N) {
        mns[u][] = INF;
        foreach (i; G[u]) {
          long tmp = C[i];
          foreach (k; 0 .. 3) {
            if (mns[u][k] > tmp) {
              swap(mns[u][k], tmp);
            }
          }
        }
      }
      
      foreach (q; 0 .. Q) {
        int u = X[q], v = Y[q];
        if (dep[u] > dep[v]) {
          swap(u, v);
        }
        debug {
          writefln("dep[%s] = %s, dep[%s] = %s", u, dep[u], v, dep[v]);
        }
        int lca;
        long ans = INF;
        Info fu, fv;
        fu.last = fv.last = -2;
        foreach_reverse (e; 0 .. E) {
          if (dep[u] <= dep[v] - (1 << e)) {
            debug {
              writefln("%s -> %s", v, par[dd[e][v].last]);
            }
            fv = (fv.last == -2) ? dd[e][v] : mul(fv, dd[e][v]);
            v = par[dd[e][v].last];
          }
        }
        if (u == v) {
          debug {
            writeln("u == v");
            writeln("fv = ", fv);
          }
          lca = u;
          chmin(ans, (mns[u][0] != dist[fv.last] - dist[u]) ? mns[u][0] : mns[u][1]);
          chmin(ans, fv.mn);
          chmin(ans, fv.xs[0]);
        } else {
          foreach_reverse (e; 0 .. E) {
            if (dep[u] - (1 << e) >= 0 && par[dd[e][u].last] != par[dd[e][v].last]) {
              debug {
                writefln("%s -> %s, %s -> %s", u, par[dd[e][u].last], v, par[dd[e][v].last]);
              }
              fu = (fu.last == -2) ? dd[e][u] : mul(fu, dd[e][u]);
              fv = (fv.last == -2) ? dd[e][v] : mul(fv, dd[e][v]);
              u = par[dd[e][u].last];
              v = par[dd[e][v].last];
            }
          }
          debug {
            writeln("lca = ", lca);
            writeln("fu = ", fu);
            writeln("fv = ", fv);
          }
          lca = par[u];
          long[2] tmps = [dist[u] - dist[lca], dist[v] - dist[lca]];
          if (tmps[0] > tmps[1]) {
            swap(tmps[0], tmps[1]);
          }
          chmin(ans, (mns[lca][0] != tmps[0]) ? mns[lca][0] : (mns[lca][1] != tmps[1]) ? mns[lca][1] : mns[lca][2]);
          if (fu.last == -2) {
            chmin(ans, dd[0][u].xs[0]);
          } else {
            chmin(ans, fu.mn);
            chmin(ans, fu.xs[0]);
          }
          if (fv.last == -2) {
            chmin(ans, dd[0][v].xs[0]);
          } else {
            chmin(ans, fv.mn);
            chmin(ans, fv.xs[0]);
          }
        }
        debug {
          writeln("lca = ", lca, ", ans = ", ans);
        }
        if (ans >= INF) {
          writeln(-1);
        } else {
          ans *= 2;
          ans += dist[X[q]] + dist[Y[q]] - 2 * dist[lca];
          writeln(ans);
        }
      }
    }
  } catch (EOFException e) {
  }
}