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Mathematics 7 Online
OpenStudy (anonymous):

Two trains, 200 kilometres apart, are moving toward each other. Each one is moving at a constant speed of 50 kilometres per hour. A fly starting on the front of one of them flies back and forth between the trains at a rate of 75 kilometres per hour. It does this until the trains collide (with unfortunate results for the fly). What is the total distance the fly has flown?

OpenStudy (mertsj):

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