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Help appreciated.
A 400yard long train travelling at 40mph enters a 5 mile long tunnel. how long elapses between the front of train entering the tunnel and the moment the end of train clears the tunnel?

8mins 15 secs

Thank you quisling, would you give me the formula please?

Sorry, 7 min 50.45secs. Didn’t read it properly. The train travels 5 miles in the tunnel, plus 400/1760 miles as it comes out. So it’s (5 + 400/1760)/40 hours, which is 470 4/9 secs

Actually 470 5/11 secs. I might get it right eventually

The front of the train has travelled 5 miles and 400 yards when the end emerges from the tunnel - 9200 yards.
40 mph is 1173 1/3 yards per minute.
Time = 7.84 seconds to 2 d.p.

Whoops! Should be minutes.

Thank you both. SORRY! I made an error the train is 440 yards long NOT 400.

Then it’s 7 mins 52.5 secs. Just 5.25/40 hours. So x 3600 is 472.5 secs

Thank you quisling, appreciated. Thank you too pedagogue.