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Railways Sample Paper RRB (Group D) Sample Test Paper-5

  • question_answer
    If a train maintains an average speed of 42 km per hour, it arrives at its destination at the right time, if however, the average speed is 40 km per hour, it arrives 15 minutes late. Find the length of the journey?

    A)  210 km

    B)  205 km

    C)  209 km

    D)  200 km

    Correct Answer: A

    Solution :

    [a] Let Length of Journey = x km. According to question, \[\frac{x}{40}-\,\frac{x}{42}=\frac{15}{60}\] \[\frac{21x-\,20x}{840}=\frac{1}{4}\] \[x=\frac{840}{4}=210\,\,km\] \[\therefore \]Length of Journey is = 210 km


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