A train 125 m long passes a man, running at 5 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is:

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  • April 26, 2019 at 12:24 pm #1397
    adminstudyheightadminstudyheight
    Keymaster

    A train 125 m long passes a man, running at 5 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is:

       A.   45 km/hr
       B.   50 km/hr
       C.   54 km/hr
       D.   55 km/hr

     

    Answer: Option B 
    Explanation:
    When the train and man are in same direction then relative speed will be the difference between their individual speeds.

    Relative Speed= 125/10 m/s =12.5 x 18/5 km/hr = 45 km/hr
    Now, let the speed of the train = x km/h.
    So, Relative speed= 45 km/hr = x -5
    Speed of the train x = 45+5= 50 km/hr 

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