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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