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BHU PMT BHU PMT Solved Paper-2004

  • question_answer
    A 100 m long train is moving with a uniform velocity of 45 km/h. The time taken by the train to cross a bridge of length 1 km is:                                                                                                                                                 [BHU PMT-2004]

    A)  58 s                                      

    B)  68 s

    C)  78 s                                      

    D)  88 s

    Correct Answer: D

    Solution :

                     Key Idea: Total distance covered by train is sum of train?s length plus length of bridge. Total time taken by train to cross the bridge                                        \[=\frac{\text{Total distance}}{\text{Velocity}}\] Total distance=Length of train + Length of bridge=100+1000=1100 m Velocity of train=45 km/h                                 \[=\frac{45\times 5}{18}=12.5\,\,m/s\]                 \[\therefore \]  \[t=\frac{1100}{12.5}=88\,\,s\]


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