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2 hours.

If the train is one mile long and going 1 mile per hour through a mile long tunnel, in one hour the train would be completely inside the tunnel, since they are the same length and the train is only going one full tunnel length(mile) per hour.

It would then take another whole hour for the end of the train to leave the tunnel, bringing the train completely out of the tunnel.

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Q: A train 1 mile long moving at a rate of 1 mile per hour enters a tunnel 1 mile long How long does it take the train to pass completely through the tunnel?
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