2. Sample Papers
  3. SSC

SSC Sample Paper Mock Test-18 SSC CGL Tear-II Paper-1

  • question_answer
    Two trains of equal length take 10 s and 15 s respectively to cross a telegraph post. If the length each train be 120 m, in what time (in seconds) will they cross each other travelling in opposite direction?

    A) 12 s     

    B)  15 s   

    C)  18 s    

    D)  20 s

    Correct Answer: A

    Solution :

    When a train crosses a telegraph post, if covers its own length. \[\therefore \] Speed of first train \[=\frac{120}{10}=12\,\,\text{m/s}\] Speed of second train \[=\frac{120}{10}=8\,\,\text{m/s}\] Relative speed \[=12+8=20\,\,\text{m/s}\] Required time\[\text{=}\frac{\text{Total}\,\,\text{length}\,\,\text{of}\,\,\text{trains}}{\text{Relative}\,\,\text{speed}}\] \[=\frac{2\times 120}{20}=12\,\,\text{s}\]


You need to login to perform this action.
You will be redirected in 3 sec spinner