Multiple choice

A $90$ m long train is running at a speed of $54$ km/hr. If it takes $30$ seconds to cross a platform, find the length of the platform.

  1. $120$ m
  2. $240$ m
  3. $360$ m
  4. $480$ m
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Convert speed to m/s: 54 km/hr = 54 * (5/18) = 15 m/s. Total distance covered in 30 seconds is 15 * 30 = 450 m. Subtracting the train length (90 m) gives the platform length: 450 - 90 = 360 m.

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