Multiple choice

Two trains start from stations A and B respectively, 50 km apart, at the same time and same speed. As the trains start, a bird flies from one train towards the other and on reaching the second train, it flies back to the first train. It repeats this process till both the trains collide. If the speed of both the trains is 25 km/hr and that of the bird is 100 km/hr, then how much did the bird travel till the time of collision? (Also consider that both the trains are moving on the same track.)

  1. 98.75 km

  2. 100 km

  3. 95.5 km

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The trains are 50 km apart and moving towards each other at 25 km/hr each. The relative speed is 50 km/hr, so they collide in 50/50 = 1 hour. The bird flies at 100 km/hr for that entire hour, covering 100 km.

AI explanation

The two trains are 50 km apart and approach each other with a relative speed of 25 plus 25, which is 50 km/hr. Using the formula time equals distance divided by speed, the trains collide in 50 divided by 50 hours, equaling 1 hour. The bird flies continuously at 100 km/hr during this time. Using the distance formula, the total distance the bird travels is 100 multiplied by 1, which is 100 km.

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