It would take 1 minute 20 seconds.
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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.
1 minute
1 mile = 1,760 yards
2 hours
About 6 minutes 5 seconds.