SOLUTION: Santa decided to use his train to deliver gifts this year. His 220 yard long train, travelling at 40 mph, enters a two mile long tunnel. How much time will elapse between the mome

Question 934540: Santa decided to use his train to deliver gifts this year. His 220 yard long train, travelling at 40 mph, enters a two mile long tunnel. How much time will elapse between the moment the front of the train enters the tunnel and the moment the end of the train clears the tunnel?

Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
1 yard = 3 feet
1 mile = 5280 feet
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(220 yard) * (3 feet/yard) * (1/5280 mile/feet)
(220) * (3) * (1/5280)
0.125 mile
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the moment the front of the train enters the tunnel:
distance from back of train to end of tunnel = tunnel length + train length
2 + 0.125 = 2.125 miles
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time elapsed between the moment the front of the train enters the tunnel and the moment the end of the train clears the tunnel:
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s = d/t
t = d/s
t = 2.125/40
t = 0.053125 hour
t = 0.053125 hour * (60 minutes/hour) = 3.1875 minutes
t = 3.1875 minutes * (60 seconds/minute) = 191.25 seconds
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