A fly's short life

Probability Level 1

Two trains are going to crash straight onto one another. They start from a distance between them of 260 km. Train A is running with 50 km/h. Train B is running with 80 km/h. A naive fly, starts flying from the start point of Train A, and keeps flying in between the two trains, going back and forth between the two trains as the distance grows smaller. The fly flies with 100 km/h... before it is crashed by the two trains crashing onto each other. By the time she dies, how many kilometers will she have travelled?


The answer is 200.

Aliki Androutsou by Aliki Androutsou , 25, Greece

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2 solutions

Tejas Panchal
Feb 20, 2014

after two hours, both trains collide. fly travels 100 *2= 200kms

3 Helpful 0 Interesting 0 Brilliant 0 Confused
Christine Teng
Mar 30, 2014

The time required for the two trains to crash is 2 hours, which is also the time the poor fly has to live. As the fly flies at 100 km/ hr, 2 times that amount (two hours) is 200 km.

As this is the first time I tried this solution thing, spare me your ill comments.

1 Helpful 0 Interesting 0 Brilliant 0 Confused

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