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    Question

    Speed of two trains 'A' and 'B' is 12 m/s and ___ m/s

    respectively. Length of 'B' and 'A' is ___ metres and 240 metres, respectively. Time taken by the trains to cross each other when moving in same direction is 40 seconds. The data given in which among the given options will fill the blank in the same order so as to make the statement true? I. 20, 80 II. 3, 120 III. 29, 440
    A All I, II and III Correct Answer Incorrect Answer
    B Both I and III Correct Answer Incorrect Answer
    C Both II and III Correct Answer Incorrect Answer
    D Both I and II Correct Answer Incorrect Answer
    E Only II Correct Answer Incorrect Answer

    Solution

    Statement I: Relative speed = 20 - 12 = 8 m/s
    Sum of length of both the trains = 80 + 240 = 320 metres
    Time taken to cross each other = (320/8) = 40 seconds So, statement I is true. Statement II: Relative speed = 12 - 3 = 9 m/s
    Sum of length of both the trains = 120 + 240 = 360 metres
    Time taken to cross each other = (360/9) = 40 seconds So, statement II is true. Statement III: Relative speed = 29 - 12 = 17 m/s
    Sum of length of both the trains = 440 + 240 = 680 metres
    Time taken to cross each other = (680/17) = 40 seconds So, statement III is true. Therefore, all statements I, II and III are true. Hence, option A.

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