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Railways Sample Paper RRB (Group D) Sample Test Paper-2

  • question_answer
    A train 150 m long passes a km stone in 30 seconds and another train of the same length travelling in opposite direction in 10 seconds. The speed of the second train is :

    A)  125 km/hr                    

    B)  25 km/hr

    C)  90 km/hr                      

    D)  75 km/hr

    Correct Answer: C

    Solution :

    [c] Speed of first train \[=\frac{150}{30}=5\]m/sec Let the speed of second train be x m/sec Relative speed \[=(5+x)\]m /sec \[\therefore \,\frac{300}{5+x}=10\] \[50+10x=300\] \[x=\frac{300-50}{10}=25\,\,m/\sec \] \[=25\times \frac{18}{5}=90\,\,km/h\]


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