Multiple choice

Two trains move in the same direction at 50 Kmph and 32 Kmph respectively. A man in the slower train observes the 15 seconds elapse before the faster train completely passes by him. What is the length of faster train?

  1. 100m

  2. 75m

  3. 120m

  4. 50m
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When two objects move in the same direction, their relative speed is the difference of their speeds. Here, relative speed = 50 - 32 = 18 kmph = 5 m/s. In 15 seconds, the faster train covers length = relative speed × time = 5 × 15 = 75m. This is the length needed for the faster train to completely pass the observer.

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