local Deque={}

Deque.lpush=function(self,value)
    local first=self.first-1
    self.first=first
    self[first]=value
end

Deque.rpush=function(self,value)
    local last=self.last+1
    self.last=last
    self[last]=value
end

Deque.lpop=function(self)
    local first=self.first
    local value=self[first]
    self[first]=nil
    self.first=first+1
    return value
end

Deque.rpop=function(self)
    local last=self.last
    local value=self[last]
    self[last]=nil
    self.last=last-1
    return value
end

Deque.size=function(self)
    return self.last-self.first+1
end

Deque.empty=function(self)
    return self.first>self.last
end

Deque.new=function()
    return setmetatable({first=0,last=-1},{__index=Deque})
end

----------

local INF=10^20

local function bfs(graph,start)
    local dist={}
    local rank={0}
    local par={}
    for i=1,#graph do
        dist[i]=INF
        par[i]=start
    end
    local que=Deque:new()
    dist[start]=0
    que:rpush(start)
    
    while not que:empty() do
        local from=que:lpop()
        for to,cost in pairs(graph[from]) do
            if dist[to]>dist[from]+cost then
                dist[to]=dist[from]+cost
                rank[to]=rank[from]+1
                par[to]=from
                que:rpush(to)
            end
        end
    end
    
    return dist,rank,par
end

----------

local n=io.read("*n")
local tree={}
for i=1,n do
    tree[i]={}
end
for i=1,n-1 do
    local a,b,c=io.read("*n","*n","*n")
    tree[a][b]=c
    tree[b][a]=c
end
local root=1
local dist
local rank
local par={}
dist,rank,par[1]=bfs(tree,root)

local bit=require("bit")
local k=1
while bit.lshift(1,k)<n do
    k=k+1
end
for i=2,k do
    par[i]={}
    for j=1,n do
        par[i][j]=root
    end
end
for i=1,k-1 do
    for j=1,n do
        if par[i][j]~=root then
            par[i+1][j]=par[i][par[i][j]]
        end
    end
end

local q=io.read("*n")
for i=1,q do
    local s,t=io.read("*n","*n")
    local length=dist[s]+dist[t]
    if rank[s]<rank[t] then
        s,t=t,s
    end
    for j=1,k do
        if bit.band(bit.rshift((rank[s]-rank[t]),(j-1)),1)>0 then
            s=par[j][s]
        end
    end
    if s~=t then
        for j=k,1,-1 do
            if par[j][s]~=par[j][t] then
                s=par[j][s]
                t=par[j][t]
            end
        end
        s=par[1][s]
    end
    io.write(length-2*dist[s].."\n")
end