A train passes a telegraph pole in 15 seconds and a tunnel of length 450 metres in 45 seconds . What is the length of the train?
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https://www.meritnation.com/ask-answer/question/a-train-past-a-pole-in-15-sec-and-a-platform-100m-long-in-25/math/6847812
https://www.meritnation.com/ask-answer/question/a-train-past-a-pole-in-15-sec-and-a-platform-100m-long-in-25/math/6847812