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OpenStudy (anonymous):
A train needs 12 seconds to go through a 50 yard tunnel. The same train going at the same speed needs 20 seconds to go through a 170 yard tunnel. What is the length of the train?
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OpenStudy (asnaseer):
I have already answered this question here: http://openstudy.com/updates/501470bae4b0fa246730e3fe
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