Multiple choice

A 100-metre long train crosses a 200-metre long and 20-metre wide bridge in 20 seconds. What is the speed of the train in km/hour?

  1. 45

  2. 36

  3. 54

  4. 57.6
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total distance = 100m + 200m = 300m. Time = 20s. Speed = 300/20 = 15 m/s. Convert to km/h: 15 * 18/5 = 54 km/h.

AI explanation

Using the standard formula for train crossing problems, distance equals speed multiplied by time. The effective crossing distance is the sum of the train and bridge lengths, which ignores the bridge width and uses only the 200 m length, giving a total of 300 m. The speed is 300 m divided by 20 seconds, resulting in 15 m/s. To convert to km/hour, multiply by 3.6 to get 54 km/hour.

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