#include<bits/stdc++.h>
using namespace std;
int main()
{
int n, m, s, r, i;
cout << noshowpoint;
while(cin >> r)
{
for(i=1; i<=r; i++)
{
cin >> n >> m >> s;
double t = (double)s/(double)(n+m);
if(n >= m)
{
double p = t*n;
p = p + (t * (n-m));
cout << p << endl;
}
else if(n<m)
{
double p = t*n;
p = p - (t * (m-n));
cout << p << endl;
}
}
}
return 0;
}
using namespace std;
int main()
{
int n, m, s, r, i;
cout << noshowpoint;
while(cin >> r)
{
for(i=1; i<=r; i++)
{
cin >> n >> m >> s;
double t = (double)s/(double)(n+m);
if(n >= m)
{
double p = t*n;
p = p + (t * (n-m));
cout << p << endl;
}
else if(n<m)
{
double p = t*n;
p = p - (t * (m-n));
cout << p << endl;
}
}
}
return 0;
}
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