Multiple choice

In what time will a train $100$ meters long with a speed of $50$ km/hr cross a pillar ?

  1. $7$ seconds
  2. $72$ seconds
  3. $7.2$ seconds
  4. $70$ seconds
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Speed = 50 km/hr = 50 * (5/18) m/s = 250/18 m/s = 125/9 m/s. Time = Distance / Speed = 100 / (125/9) = 900 / 125 = 7.2 seconds.

AI explanation

To cross a stationary pole, the train must cover a distance equal to its own length, which is 100 meters. Using the standard conversion, a speed of 50 km/hr equals 50 multiplied by 5/18, which is 125/9 m/sec. The time taken is distance divided by speed, so 100 divided by 125/9 equals 900 divided by 125, resulting in 7.2 seconds.

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