Multiple choice

Single Correct Answer Type A train of $150\ \text{m}$ length is going towards north direction at a speed of $10\ \text{m/s}$. A parrot flies at a speed of $5 \text{ m/s }$ towards south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to

  1. $12\ \text{s}$
  2. $8\ \text{s}$
  3. $15\ \text{s}$
  4. $10\ \text{s}$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Since the train and the parrot are moving in opposite directions, their relative speed is the sum of their individual speeds, which is 10 m/s + 5 m/s = 15 m/s. The distance to be covered to completely cross the train is equal to the length of the train, which is 150 m. Dividing the distance by the relative speed gives a time of 10 seconds.

AI explanation

Because the train and the parrot are travelling towards each other, their relative speed is the sum of their individual speeds, which is 10 m/s + 5 m/s = 15 m/s. The distance the parrot must cover to cross the train is equal to the length of the train, 150 m. Dividing the distance by the relative speed gives a time of 150 m divided by 15 m/s, which equals 10 s.

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