package test;

import java.util.Scanner;

public class Main {
	
	public static double cal(double n,double x,double vx,double y,double vy,double mid) {
		double l1 = Math.min((mid-x + mid)/vx,(x*2 + mid-x)/vx);
		double l2 = Math.min((y-mid + n - mid)/vy,(n-y + n-mid)/vy);
		
		return Math.max(l1,l2);
	}
	
	public static void main(String[] arg) {
		Scanner input = new Scanner(System.in);
		
		int caset = input.nextInt();
		double eps = 0.00001;
		
		while(caset > 0) {
			caset--;
			
			double n = input.nextDouble();
			double x = input.nextDouble();
			double vx = input.nextDouble();
			double y = input.nextDouble();
			double vy = input.nextDouble();
			
			if(x > y) {
				double c = x;
				double vc = vx;
				x = y;
				vx = vy;
				y = c;
				vy = vc;
			}
			
			double t1 = Math.max((n-x)/vx,y/vy);
			double t2 = (x + n-y + n)/(vx + vy);
			double t3 = Math.min((Math.min(x,n-x) + n)/vx,(Math.min(y,n-y) + n)/vy);
			
			double l = x;
			double r = y;
			
			while(r - l > eps) {
				double mid = (l+r)/2;
				
				if(cal(n,x,vx,y,vy,mid-eps) < cal(n,x,vx,y,vy,mid+eps)) r = mid;
				else l = mid;
			}
			
			double mid = (l+r)/2;
			
			double ans = Math.min(t1,t2);
			ans = Math.min(ans,t3);
			ans = Math.min(ans,cal(n,x,vx,y,vy,mid));
			
			System.out.printf("%.5f\n",ans);
			
		}
		
		
		
	}
}

Please don't specify the package.