Two red buses, 200 km apart, are moving toward each other at the speed of
50 km/hour each. A fly takes off from one red bus flying straight toward
the other at the speed of 75 km/hour. Having reached the other red bus,
the fly bounces off it and flies back to the first red bus. The fly
repeats the trip until the trains collide and the bug is squashed.
What distance has the fly traveled until its death?
NB. Think outside the box.
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