Two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speeds is: A. 1 : 3 B. 3 : 2 C. 3 : 4 D. None of these

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The answer in none of these - since the length of the train is not mentioned in the question!
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The answer in none of these - since the length of the train is not mentioned in the question!
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