Solution #90: The Amorous Commuter

The Slough trains depart from Maiden head at five past every hour. The Reading Trains depart at ten past the hour.

If John arrives at any time between ten past the hour and five past the next hour, then the first train to arrive will be bound for Slough. He will catch the Reading train only if he happens to arrive between five past and ten past the hour. It is therefore 11 times more likely that he will catch the Slough train than the Reading train.

Source: Sloane, Paul
Categories: Reasoning, Probability
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