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Mathematics 25 Online
OpenStudy (anonymous):

My aunt and I were approaching the same intersection she from the south and I from the west. She was traveling at a steady speed of 8 miles/hour, while i was approaching the intersection at 70 miles/hour. At a certain instant of time I was seven tenths of a mile from the intersection, while she was seven 20ths of a mile from it. How fast were we approaching each other at that instant?

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