[boomoo]

Originally Posted by GypsyGoth

He has an inquisitive mind, I think it's part of his appeal. He's always looking for different angles and twists when confronted with situations.

That is true. Sometimes he is right because something is obvious but often he is wrong.
Basically he is guessing. If you guess in multiple choice questions you will get at least 25% correct.

Working out timings and saying something else is going to happen is not really the sign of a detective. He has access to a clock. In past times they did not have a clock.