Multiple choice

A train running at a speed of $84$ km/hr crosses an electric pole in $9$ seconds. What is the length of the train in metres?

  1. $126$
  2. $630$
  3. $210$
  4. $70$
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C Correct answer
Explanation

Speed = 84 km/hr = 84 * (5/18) m/s = 70/3 m/s. Length = Speed * Time = (70/3) * 9 = 210 meters.

AI explanation

Using the unit conversion formula, 84 km/hr multiplied by 5/18 equals 70/3 m/s. Because crossing a pole means the distance equals the length of the train, we use distance equals speed multiplied by time. Therefore, the length is 70/3 m/s multiplied by 9 seconds, which equals 210 m. The result is 210 m.

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