Question

    A 180 m long train crosses another 320 m long train

    running in the opposite direction in 10 seconds. If the shorter train crosses a pole in 9 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 72 km/hr Correct Answer Incorrect Answer
    D 60 km/hr Correct Answer Incorrect Answer
    E 36 km/hr Correct Answer Incorrect Answer

    Solution

    Speed of the shorter train = 180/9 = 20 m/sec Let the speed of the longer train be x km/hr According to the question, ⇒ (20 + x) = (180 + 320)/10 ⇒ 20 + x = 500/10 ⇒ x = 50 – 20 = 30 ⇒ x = 30 x 18/5 = 108 km/hr

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