Multiple choice general knowledge math & puzzles

A train 125 m long passes a man, running at 5 kmph in the same direction in which the train is going, in 10 seconds. The speed of the train is:

  1. 45 km/hr

  2. 50 km/hr

  3. 54 km/hr

  4. 55 km/hr

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

Relative speed = Distance / Time = 125 / 10 = 12.5 m/s. Converting to kmph: 12.5 * (18/5) = 45 kmph. Since they move in the same direction, Relative Speed = Train Speed - Man Speed. 45 = V - 5, so V = 50 kmph.