几何概率——SGU144 Meeting

#include<stdio.h>

int main()
{
    int x,y;
    double z;
    scanf("%d%d%lf",&x,&y,&z);

    double t=(y-x)*60;
    t=(t-z)*(t-z)*1.0/t/t;
    printf("%.7lf\n",1-t);
}