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Railways Sample Paper RRB (Group D) Sample Test Paper-13

  • question_answer
    With average speed of 40 km/hour, a train reaches its' destination in time. If it goes with an average speed of 35 km/hour, it is late by 15 minutes. The total journey is

    A)  30 km 

    B)  40 km

    C)  70 km 

    D)  80 km

    Correct Answer: C

    Solution :

    [c] If the total length of journey be x km, then \[\frac{x}{35}-\,\frac{x}{40}=\frac{15}{60}\] \[\Rightarrow \frac{8x-\,7x}{280}=\frac{1}{4}\] \[\Rightarrow \frac{x}{280}=\frac{1}{4}\] \[\Rightarrow x=\frac{1}{4}\times 280=70\,\,km\]


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