Multiple choice

There are two trains moving in opposite directions with the same speed of 50 km/hr and are 100 kms apart at the point of start. There is a bird which flies from one train to the other and repeats the same process as soon as it reaches the other at the speed of 100 km/hr. Calculate the distance travelled by the bird when the trains meet each other.

  1. 75 km

  2. 100 km

  3. 120 km

  4. 150 km

  5. 200 km
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The trains are 100 km apart and move toward each other at 50 km/hr each. Relative speed is 100 km/hr, so they meet in 1 hour. The bird flies at 100 km/hr for that entire hour, covering 100 km.

AI explanation

The relative speed of the two trains is the sum of their speeds, so they approach each other at 50 plus 50, which is 100 km/hr. The time taken for the trains to meet is the initial distance divided by the relative speed, meaning 100 km divided by 100 km/hr equals 1 hour. The distance the bird travels is its speed multiplied by this time, so 100 km/hr multiplied by 1 hour equals 100 km.

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