#include <bits/stdc++.h>
using namespace std;
int main()
{
double d,u,v,t1,t2;
int count,n;
cin>>n;
count=1;
while(n--)
{
cin>>d>>v>>u;
if(u==0 ||v==0 ||u<=v)
{
printf("Case %d: can't determine\n",count);
continue;
}
t1=d/u;
t2=d/sqrt(u*u-v*v);
printf("Case %d: %.3lf\n",count,t2-t1);
count++;
}
return 0;
}
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