//
// Created by 35417 on 2025/4/2.
//
#include<bits/stdc++.h>

using namespace std;
#define ld long double

ld get(ld x1, ld y1, ld x2, ld y2, int v) {
    return (abs(x1 - x2) + abs(y1 - y2)) / v;
}

void solve() {
    ld a, b, x1, x2, x3, y1, y2, y3;
    cin >> a >> b >> x1 >> y1 >> x2 >> y2 >> x3 >> y3;
    ld res = get(x1, y1, x3, y3, a);
    ld l = min(x1, x2), r = max(x1, x2), u = max(y1, y2), d = min(y1, y2);
    ld x4 = max(l, min(r, x3)), y4 = max(d, min(u, y3));
    if(get(x1, y1, x4, y4, a) < get(x2, y2, x4, y4, b)) {
        res = min(res, get(x2, y2, x3, y3, b));
    } else {
        ld t = get(x1, y1, x2, y2, a+b);
        ld dis = abs(x3-x1)+abs(y3-y1) - t*a;
        res = min(res, t+dis/b);
    }
    cout<<fixed<<setprecision(12)<<res<<"\n";
}

signed main() {
    ios::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);
    int T = 1;
    cin >> T;
    for (int i = 1; i <= T; i++) solve();
    return 0;
}