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Mathematical poser

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cazzle | 16:51 Mon 10th Mar 2008 | Quizzes & Puzzles
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I'd really appreciate some help with this poser....

I was out walking with my dog at a steady pace of 12 min per km when my dog ran off at a steady pace to a gate I knew to be 625ft ahead and then returned to me. He did this 4 times in all without stopping. He finally returned to me when we were 81ft from the gate. What speed was my dog running at over this period?

Thanks in advance!
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Odd that its mixing metric and imperial -- is it 12 mins per Km or 12 mins per mile?

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