Multiple choice

The length of each coach of a train is 15 m and length of engine is 10 m. If there are total 20 coaches in the train, in how many seconds will the train moving at the speed of 144 km/hr cross 50 m long platform?

  1. $15$
  2. $18$
  3. $9$
  4. $2$
  5. $None of these$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Total distance = length of train + length of platform = (20 × 15 + 10) + 50 = 300 + 10 + 50 = 360m. Speed = 144 km/hr = 144 × 5/18 = 40 m/s. Time = Distance/Speed = 360/40 = 9 seconds. Option C (9) is correct. Key steps: convert speed to m/s, calculate total length (train + platform), then time = distance/speed.

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