View Compilation Error

0_0_15380926_2904.cpp: In function 'int judge(double, double, double)':
0_0_15380926_2904.cpp:37:23: error: 's' was not declared in this scope
         return (900 + s) / v1 <= ((900 - s) / v2 + t);
                       ^
0_0_15380926_2904.cpp:46:23: error: 's' was not declared in this scope
         return (900 + s) / v1 <= ((600 - s) / v2 + t);
                       ^