Between the two towns of Nijmegen and Venlo runs one railroad track, on which one train travels back and forth. Annette, who lives near the railroad, leaves home every morning at a random time between nine and half past nine to walk her dog. Every day she walks the same route to the railroad, plays with her dog until the train has passed, and then walks back home. You would expect Annette to spot the train to Nijmegen as often as the train towards Venlo, but that is not the case! Annette sees the train to Nijmegen five times as often as the train to Venlo.

The question: How is that possible?

The answer: Click here!