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Mathematics, 03.07.2019 18:30 blewcblankz56

If ying zyiyu covered the first 200 miles of a trip going at 50 mph and the last hundred miles going at 40 mph, what was his average speed for the entire trip?

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If ying zyiyu covered the first 200 miles of a trip going at 50 mph and the last hundred miles going...
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