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    Question

    A 180 m long train crosses another 270 m long train

    running in the opposite direction in 12 seconds. If the shorter train crosses a pole in 12 seconds, what is the speed of longer train?
    A 108 km/hr Correct Answer Incorrect Answer
    B 90 km/hr Correct Answer Incorrect Answer
    C 63 km/hr Correct Answer Incorrect Answer
    D 60 km/hr Correct Answer Incorrect Answer
    E 81 km/hr Correct Answer Incorrect Answer

    Solution

    Speed of the shorter train = 180/12 = 15 m/sec Let the speed of the longer train be x km/hr According to the question, ⇒ (15 + x) = (180 + 270)/12 ⇒ 15 + x = 450/12 ⇒ x = 450/12 – 15 = 270/12 ⇒ x = 90/4 x 18/5 = 81 km/hr

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