Multiple choice

A $150$ meter long train is moving towards north with a velocity of $10m/s$. A parrot is flying in the south direction parallel to train at $5m/s$. The time taken by the parrot in crossing the train is

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

The train moves North at 10 m/s and the parrot moves South at 5 m/s. Their relative speed is 10 + 5 = 15 m/s. Time = Distance / Relative Speed = 150 / 15 = 10 seconds.

AI explanation

Since the train and the parrot are moving in opposite directions, their relative speed is the sum of their individual speeds, giving 10 m/s + 5 m/s = 15 m/s. To cross the train completely, the parrot must cover a distance equal to the length of the train, which is 150 m. Using the formula time equals distance divided by speed, the time taken is 150 m divided by 15 m/s, which equals 10 s.

Keep practicing — related questions