int t = Next();
            for(int ti = 0; ti < t; ti++) {
                long a1 = Next();
                long b1 = -Next();
                long a2 = Next();
                long b2 = -Next();
                long z = Next();
                long x1 = 0;
                long x2 = 0;
                bool day = true;
                double ans = 0;
                for(int i = 1; i <= z; i++) {
                    long v1 = day ? a1 : b1;
                    long v2 = day ? a2 : b2;
                    long nx1 = x1 + v1;
                    long nx2 = x2 + v2;
                    if(nx1 > nx2) {
                        if(x1 > x2) {
                            ans += 1;
                        }
                        else {
                            ans += 1 - (x1 - x2) / (double) (v2 - v1);
                        }
                    } else if(x1 > x2) {
                        ans += (x1 - x2) / (double) (v2 - v1);
                    }
                    x1 = nx1;
                    x2 = nx2;
                    if(i % 12 == 0)
                        day = !day;
                }
                string a = Convert.ToString(ans, new CultureInfo("en-us"));
                writer.WriteLine(a);
            }