Multiple choice general knowledge math & puzzles

A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the train in 54 km/hr, what is the length of the platform?

  1. 120m

  2. 240m

  3. 300m

  4. None of these

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Speed = 54 km/hr = 15 m/s. Time to pass a man = 20s, so train length = 15 × 20 = 300m. Time to pass platform = 36s. Total distance covered = train length + platform length = 300 + L. So 15 × 36 = 300 + L, giving L = 240m. Answer B matches this calculation.