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    Question

    A train would take 20 seconds to cross a stationary

    pole. If the train was 200m shorter, it would have taken 10 seconds less. Find the speed of the train.
    A 24 m/sec Correct Answer Incorrect Answer
    B 18 m/sec Correct Answer Incorrect Answer
    C 15 m/sec Correct Answer Incorrect Answer
    D 12 m/sec Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the original length of the train = Ā x m āˆ“ Speed of the original train = x/20 m/s āˆ“ Length of the shorter train = x-200 āˆ“ speed of the shorter train = (x-200)/10 m/s Since, both the train are same their speed are also same āˆ“ (x )/20 = (x-200)/10 āŸ¹ 10 x = 20 x- 4,000 10 x =4,000 Ā x = 400 āˆ“ Speed = x/20 =400/20 = 20m/s

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