Multiple choice general knowledge math & puzzles

Two trains, 500 km apart, are travelling towardseach other, one at the speed of 40 kmph and the other at the speed of 60 kmph. A bird starts flying to and fro from one train to the other at a speed of 10kmph. Find the distance covered by the bird from the beginning till one hour before the two trains meet each other.

  1. 50

  2. 40

  3. Can't Calculate as the series goes into an infinite Geometric Progression

  4. The bird gets too tired to fly after one hour.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The trains approach each other at 40+60=100 kmph, so they meet in 5 hours (500/100). The bird flies for 4 hours (one hour before meeting), covering 10×4=40 km. Option C is a distractor invoking infinite series unnecessarily - this is a simple time×speed problem. Option D is a joke option.

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