Multiple choice

A train covers a distance of 12 km in 10 minutes. If it takes 6 secs to pass the telegraph post, then the length of the train is

  1. $100m$
  2. $140m$
  3. $120m$
  4. $90m$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Speed = 12 km / 10 min = 72 km/h = 72 × 1000/3600 = 20 m/s. Length = speed × time = 20 × 6 = 120 m. The train passes a fixed point in 6 seconds at its constant speed. Option C is correct.

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