Multiple choice general knowledge math & puzzles

Two trains, 200 kilometres apart, are moving towards each other, each going at a speed of 50 kmph. A crazy fly, starting on the front end on one of the trains flies back and forth between them at the rate of 75 kmph. It touches one train returns to the other and flies back, doing this continuously till the trains collide, crushing the insect. What is the total distance the fly travelled before it got crushed?

  1. 200Km

  2. 150 Km

  3. 75Km

  4. 300Km
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The trains are 200km apart and close the gap at a combined speed of 100 kmph (50+50). They will collide in 2 hours. The fly travels at 75 kmph for those 2 hours, covering a total distance of 150 km.

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