Answer: The one that doesn't work is best as it will always be correct twice a day, but the one that loses a minute a day will not be correct again for 720 days (losing 720 minutes or 12 hours).
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The one that doesn’t work is best as it will always be correct twice a day, but the one that loses a minute a day will not be correct again for 720 days (losing 720 minutes or 12 hours).
Answer: In the back. The train will be accelerating so it will be going faster when the back of the train enters the tunnel so a person in the back will spend less time in the tunnel.