Multiple choice

A train crosses a pole in 30 seconds with a speed of 60 km/hr. The length of the train is

  1. 1000 m

  2. 900 m

  3. 750 m

  4. 500 m
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D Correct answer
Explanation

Speed = 60 km/hr = 60 * (5/18) m/s = 50/3 m/s. Length = Speed * Time = (50/3) * 30 = 500 m.

AI explanation

To find the length of the train, convert its speed from km/hr to m/s by multiplying by 5/18, which gives 60 multiplied by 5/18 to equal 50/3 m/s. Since a train crossing a pole covers a distance equal to its own length, the length is calculated as speed multiplied by time. Therefore, the length of the train is 50/3 m/s multiplied by 30 seconds, resulting in 500 m.

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