WBCS.LIVE practice question

A fast-moving train that is 150 meters long is running at a speed of 72 km/hr. How long will it take to completely pass a bridge that is

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

  1. 15 seconds
  2. 18 seconds
  3. 20 seconds
  4. 25 seconds

Correct answer and explanation

Correct answer: 20 seconds

Explanation: ✅ Correct Answer: C) 20 seconds 📚 Explanation: First, convert the train's speed from km/hr to m/s by multiplying by 5/18. So, 72 × (5 ÷ 18) = 20 m/s. When a train crosses a bridge, the total distance it must cover is its own length plus the length of the bridge. Distance = 150 + 250 = 400 meters. Time = Distance ÷ Speed = 400 ÷ 20 = 20 seconds.