Multiple choice

If a train of length 650 m long is running at the speed of 72 km/h, crosses a bridge in 1 minute 15 second, then what is the length of the bridge?

  1. $750 m$
  2. $550 m$
  3. $850 m$
  4. $1250 m$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Speed = 72 km/h = 20 m/s. Time = 75 seconds. Distance = 20 × 75 = 1500 m. This equals train length + bridge length. Bridge = 1500 - 650 = 850 m. Convert speed to m/s by multiplying by 5/18.

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