Miles apart traveling directly toward each other

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If two trains are 100 miles apart traveling directly toward each other, with one moving at 5 mph and the other moving at 10 mph, and a fly starts at the front of one train and goes directly toward the other train at 15 mph, then turns around when it reaches it and flies back, etc. until the trains collide, how far will the fly move?

Reference no: EM131046687

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