#yuki-1365
from collections import defaultdict

class UnionFind():
    def __init__(self, n):
        self.n = n
        self.roots = [-1]*n

    def find(self, x):  #根を見つける
        if self.roots[x] < 0:
            return x
        else:
            self.roots[x] = self.find(self.roots[x])  #つなぎ直す
            return self.roots[x]

    def union(self, x, y):  #x,yが入っている部分集合を合体させる
        x = self.find(x)
        y = self.find(y)
        if x == y:
            return
        if self.roots[x] > self.roots[y]:
            x, y = y, x
        self.roots[x] += self.roots[y]
        self.roots[y] = x

    def size(self, x):  #ある元が入っている部分集合の大きさを求める
        return -self.roots[self.find(x)]

    def same(self, x, y):
        return self.find(x) == self.find(y)

    def members(self, x):
        root = self.find(x)
        return [i for i in range(self.n) if self.find(i) == root]

    def roots(self):
        return [i for i, x in enumerate(self.roots) if x < 0]

    def group_count(self):
        return len(self.roots())

    def all_group_members(self):  #defaultdictの形で各部分集合を返す
        group_members = defaultdict(list)
        for member in range(self.n):
            group_members[self.find(member)].append(member)
        return group_members

    def __str__(self):
        return '\n'.join(f'{r}: {m}' for r, m in self.all_group_members().items())

N = int(input())
u = UnionFind(N)
A = list(map(int, input().split()))  #初期エネルギー
B = list(map(int, input().split()))  #目標エネルギー
P = list(map(int, input().split()))  #重みづけ
Q = int(input())
for _ in range(Q):
    X, Y = map(int, input().split())
    u.union(X-1, Y-1)
    fuan = 0
    for v in u.all_group_members().values():
        d, G = 0, []
        for i in v:
            d += A[i]-B[i]
            if P[i] != 0:
                G.append(1/P[i])
            else:
                break
        d = abs(d)
        g = sum(G)
        fuan += sum(x/(g**2) for x in G)*d**2
        
    print(fuan)