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  1. A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?

    2. A.

    40 sec
    B.

    42 sec
    C.

    45 sec
    D.

    48 sec

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    Answer : Option A

    Explanation :

     

    Formula for converting from km/hr to m/s:   X km/hr =   \([ X X \frac { 5 } {18 }]\)     m/s.
     

     

    Therefore, Speed = [ 45 X \(\frac {5 } { 18 }]\)     m/sec =   m/sec.
       

     

    Total distance to be covered = (360 + 140) m = 500 m.

     

    Formula for finding time=  \([\frac { Distance } { speed } ]\)    
     

     

     Required time = \([\frac {500*2 } { 2 5} ]\)     sec = 40 sec.
     

     

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