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daily express mensa puzzle 11/06/12

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alison6399 | 19:34 Mon 11th Jun 2012 | Quizzes & Puzzles
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Hi

Please could someone help with today's puzzle. Details as follows:

A train 275 yards long, travelling at 30 mph, enters a tunnelof 4.5 miles il length. How long will it take from the moment the front of the train enters the tunnel til the monment the end of the train clears the tunnel

Please explain answer

Thanks
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Will fone my grandson - hopeless at maths
1 mile= 1760 yards. 1760x 4.5= 7920. Plus length of train 275 yards= 8195 yards. Divided by 1760= 4.65625 miles. 30 mph = 2minutes per mile so multiply the miles travelled by 2. 2 x 4.65625 = 9.3125 minutes

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daily express mensa puzzle 11/06/12

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