Multiple choice

A 140 m. long train is moving at the speed of 70 km./hr. In what time the train will cross a person moving in the same direction at the speed of 4 km./hr. ? (approx)

  1. 8 second

  2. 16 second

  3. 20 second

  4. 24 second

  5. 10 second
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Relative speed when moving in same direction = 70 - 4 = 66 km/hr. Convert to m/s: 66 × 1000/3600 ≈ 18.33 m/s. Time = distance/relative speed = 140/18.33 ≈ 7.64 seconds ≈ 8 seconds. Option B would be correct if speeds were subtracted incorrectly.

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