Multiple choice

If a $200$ m long train crosses a platform of the same length as that of the train in $20$ seconds, then the speed of the train is

  1. $50\ \text{km/hr}$
  2. $60 \ \text{km/hr}$
  3. $72\ \text{km/hr}$
  4. $80\ \text{km/hr}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total distance = 200 + 200 = 400 m. Time = 20 s. Speed = 400 / 20 = 20 m/s. Convert to km/hr: 20 * (18/5) = 72 km/hr.

AI explanation

The total distance covered is the sum of the train's length and the platform's length, so 200 meters plus 200 meters equals 400 meters. The speed in meters per second is 400 meters divided by 20 seconds, yielding 20 meters per second. Multiplying 20 by 18/5 to convert to kilometers per hour gives a speed of 72 kilometers per hour.

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