The 12:50, because it's 10 to 1 if you catch it.
If you say ten to one something will or will not happen, you mean it is very likely that it will or will not happen.
更多英语谜语
What sneaks through doors and windows without knocking?
What has no beginning, end, or middle?
What's the largest number of coins you can have without having even change for a dollar?
What jumps when it walks and sits when it stands?