Insight · ★★☆☆☆ · ~5 min
The Train Timing Trick
Equal train frequencies, yet he goes one way 90% of the time. Why?
by MindYourPuzzle
A commuter arrives at a subway station at a random time. Two trains run at the same frequency (every 10 minutes) — one going to destination A, one to destination B. The commuter always boards whichever train arrives first. Yet over time, they end up at destination A nine times more often than destination B.
Why?
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