Two trains, 200 km apart, are moving toward each other at the speed of 50 km/hour each. A fly takes off from one train flying straight toward the other at the speed of 75 km/hour. Having reached the other train, the fly bounces off it and flies back to the first train. The fly repeats the trip until the trains collide and the bug is squashed.
What distance has the fly traveled until its death?
There is a complicated and an easy way to calculate this cool math puzzle.
Think outside the box.

• relative speed of two trains approaching each other will be 50+50=100kph
  Dist between them 200km .
  hence time for collision =200/100=2hrs
  For this 2hrs fly can travel(theoretically)=75kph*2=150km.
  I find this one the easiest approach to solve.
  Waiting for the out of box solution.
• 10 years agoHelpfull: Yes(1) No(0)
• Lets consider time = x
  So the equation will be
  50x+50x=200
  X=2 hours
  Fly speed = 75kmph
  75*2=150 km
  
• 10 years agoHelpfull: Yes(0) No(0)