# How long will elapse between the moment the front of the train enters the tunnel and the moment the end.................

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A 400 yard long train, travelling at 30 mph, enters a 4.5 mile long tunnel.

How long will elapse between the moment the front of the train enters the tunnel and the moment the end of the train clears the tunnel?

posted Jun 14

400 yard=0.227273 miles
(4.5+0.227273)/30=0.157575767 hrs = 9 min 28 sec

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