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Railways Sample Paper RRBs Assistant Loco Pilot and Technician CBT STAGE-I Sample Paper-4

  • question_answer
    A 150 m long train crosses a mile-stone in 15 s and a train of same length coming from opposite direction in 12 s. The speed of other train is

    A)  36 km/h

    B)         54 km/h

    C)  50 km/h           

    D)  45 km/h

    Correct Answer: B

    Solution :

    Sped of first train \[=\frac{150}{15}=10\,\,m/s\] Second case,\[\frac{150+150}{x+10}=12,\] where    x = speed of other train \[\Rightarrow \,\] \[300=12x+120\] \[\Rightarrow \,\] \[x=\frac{180}{12}=15\,\,m/s\] \[\therefore \] Required speed \[=15\times \frac{18}{5}=54\,\,km/h\]


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