Multiple choice

ஒரு ரயில் நடைமேடை 35 நொடிகளிலும், நடைமேடையில் நின்ற மனிதனை 20 நொடிகளிலும் கடக்கிறது. ரயிலின் வேகம் 54 கி.மீ எனில் நடைமேடையின் நீளம் என்ன? A train crosses the platform in 35 seconds and the man in the platform in 20 seconds. If the speed of the train is 54 km, what is the length of the walking platform?

  1. 225 மீ / 225m

  2. 200 மீ/ 200m

  3. 500 மீ/ 500m

  4. 300 மீ/ 300 m

  5. இவற்றில் ஏதுமில்லை/None of these
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A Correct answer
Explanation

The train speed is 54 km/h = 15 m/s. In 20 seconds, it travels 300 m, which is the train's length. In 35 seconds, it travels 525 m, so the platform length is 525 - 300 = 225 m.

AI explanation

First, convert the train's speed from kilometers per hour to meters per second by multiplying 54 by 5/18, yielding 15 m/s. Since the man is standing still, the length of the train is the speed multiplied by the time taken to pass him: 15 m/s multiplied by 20 s equals 300 m. To find the length of the platform, calculate the total distance covered in 35 seconds, which is 15 m/s multiplied by 35 s, giving 525 m. Subtracting the train's length from this total distance gives the platform length: 525 m minus 300 m equals 225 m. The length of the platform is 225 m.

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