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SSC Sample Paper SSC CGL - Sample Paper-20

  • question_answer
    A train passes a 50 m long platform in 14 s and a mi standing on a platform in 10 s. The speed of the train is

    A) 24 km/h            

    B) 26 km/h

    C) 40km/h             

    D) 45 km/h

    Correct Answer: D

    Solution :

    Let length of train \[=x\,m\] \[\therefore \]      Speed of train \[=\frac{x}{10}\]              ?(i) and       \[\frac{(50+x)10}{x}=14\] \[\Rightarrow \]   \[500+10x=14x\] \[\Rightarrow \]               \[4x=500\] \[\Rightarrow \]                 \[x=125\,m\] \[\therefore \]      Speed of train\[=\frac{125}{10}=12.5\,m/s\]             \[=\frac{12.5\times 18}{5}=45\,\text{km/h}\]


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