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SSC Sample Paper SSC (Group-C) Sample Test Paper-10

  • question_answer
    Two rifles are fired from the same place at a difference of 11 min. 45 seconds. But a man who is coming towards the same place in a train hears the second sound after 11 minutes. Find the speed of the train (Assuming speed of sound\[=330\text{ }m/\text{ }s\]).

    A)  \[72\text{ }km/h\]                  

    B)  \[36\text{ }km/h\]

    C)  \[81\text{ }km/h\]      

    D)       \[108\text{ }km/h\]

    Correct Answer: C

    Solution :

     Difference of time =11 minutes 45 seconds - 11 minutes = 45 seconds Distance covered by sound in 45 seconds = Distance covered by train in 11 minutes \[330\times 45=11\times 60\times \]Speed of train Speed of train \[=\left( \frac{330\times 45}{11\times 60} \right)m/\sec .\] \[=\left( \frac{45}{2}\times \frac{18}{5} \right)\,kmph.\]


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