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I would never forsake you.
If the guy runs back to the start, he just makes it out in time. That means that if he runs a quarter the length of the tunnel, the train will be at the start. Therefore, if he runs a quarter of the length the other way, ie to the centre of the tunnel, then the train must also be at the start. So to get out the other end just in time the man must then cover half the length of the tunnel whilst the train covers the entire length ie he must run at exactly half of the speed that the train moves. He therefore runs at 10 miles per hour.
Organic foods: do you buy them?
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