#include<bits/stdc++.h>
using namespace std;
long long gcd(long long x,long long y)
{
	if(y==0)
	{
		return x;
	}
	return gcd(y,x%y);
}
int T;
long long x,y,z;
int main()
{
	freopen("math.in","r",stdin);
	freopen("math.out","w",stdout);
	cin>>T;
	while(T--)
	{
		cin>>x>>z;
		z/=x;
		long long Gcd=gcd(x,z);
		y=z/Gcd;
		if(y==1&&x!=z*x)
		{
			puts("-1");
		}
		else
		{
			cout<<y<<"\n";
		}
	}
}