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My VK channel — https://vk.com/yellow.school Two trains are moving towards each other at a speed of 50 km/h each. At the moment when there were 100 km between them, a fly takes off from the windshield of one train and flies towards the other train at a speed of 100 km/h. When it crashes into the windshield of the second, it turns around and flies back to the first. Having reached it, it turns around again and flies to the second. And so on until the trains meet. How many kilometers did the fly fly?