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    Question

    A train 200 metre long takes 30 sec to cross a man

    running at a speed of 4 km/hr in the direction opposite to that of train. What is the speed of the train?
    A 15 km/hr Correct Answer Incorrect Answer
    B 18 km/hr Correct Answer Incorrect Answer
    C 30 km/hr Correct Answer Incorrect Answer
    D 20 km/hr Correct Answer Incorrect Answer

    Solution

    Let the speed of the train be x Relative speed = (x + 4) km/hr ⇒ (x + 4) = (200 × 18)/(30 × 5) ⇒ (x + 4) = (3600)/(150) ⇒ x + 4 = 24 ⇒ x = 24 – 4 = 20 km/hr

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