# A 330 yard long train, travelling at 50 mph, enters a.............and the moment the end of the train clears the tunnel?

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A 330 yard long train, travelling at 50 mph, enters a three 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 Jan 8, 2016

Train length=d1=330yard
Tunnel length=d2=3miles=3*1760=5280yards
Total distance=d=d1+d2=330+5280=5610yards
Speed=S=50mph={(50*1760)/3600}yard/sec
Time=t=d/s=5610/{(50*1760)/3600}=229.5sec
Ans is 229.5 sec

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