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Multiple choice

A moving train passes a platform 50 metres long in 14 seconds and a lamp post in 10 seconds. The speed of the train is

  1. $24 km/hr$
  2. $36 km/hr$
  3. $40 km/hr$
  4. $45 km/hr$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Train passes lamp post in 10 seconds, so its length = speed × 10. Platform crossing adds 50m, so speed = 50/4 = 12.5 m/s = 45 km/hr.

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