Multiple choice

How many seconds will a train 100 meters long take to cross a bridge 150 meters long if the speed of the train is 36 kmph?

  1. 20

  2. 30

  3. 35

  4. 25
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Speed = 36 kmph = 36 * 5/18 = 10 m/s. Total distance = 100 + 150 = 250 m. Time = 250 / 10 = 25 seconds.

AI explanation

The total distance the train must cover to cross the bridge is its own length plus the bridge length: 100 m + 150 m = 250 m. Convert the speed of 36 kmph to m/sec by multiplying by 5/18, resulting in 10 m/sec. The time taken is the total distance divided by the speed, which is 250 m / 10 m/sec = 25 seconds.

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