What is the Length of Bridge? If

The length of the bridge, which a train 130 meters long and travelling at 45 km/hr can cross in 30 seconds is:

  1. 245 m
  2. 225 m
  3. 200 m
  4. 250 m
Monis Rasool Professor Asked on 13th June 2015 in Maths.
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  • 1 Answer(s)
    Best answer

    Answer: (1) 245 m
    Explanation:-

    Let be the length of the bridge = X m
    Speed of the train = 45km/h = 45 x 5/18
    = 25/2 m/sec.
    According to the question,
    (X + 130)/(25/2)  = 30
    2(X + 130) = 30 x 25
    2X + 260 = 750
    2X = 750 – 260
    2X = 490
    X = 490/2 = 245

    Hence, the length of the bridge is 245 m.

    Anurag Mishra Professor Answered on 13th June 2015.
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