A girl starts at a point A and runs east at a rate of f/sec. One...
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A girl starts at a point A and runs east at a rate of f/sec. One minute later, another girl starts at A and runs north at a rate of 8f sec. At what rate is the distance between them changing 1 minute after the second girl starts? A girl starts at a point A and runs east at a rate of f/sec. One minute later, another girl starts at A and runs north at a rate of 8f sec. At what rate is the distance between them changing 1 minute after the second girl starts?
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