Multiple choice general knowledge math & puzzles

A jogger running at 9 kmph alongside a railway track in 240 metres ahead of the engine of a 120 metres long train running at 45 kmph in the same direction. In how much time will the train pass the jogger?

  1. 3.6secs

  2. 18secs

  3. 36secs

  4. 72secs

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

Relative speed = 45 - 9 = 36 kmph = 10 m/s. Total distance to cover = distance ahead + train length = 240 + 120 = 360 metres. Time = Distance / Speed = 360 / 10 = 36 seconds. The distractors represent calculation errors in relative speed or distance.