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how can you go 80 miles per hour on a bicycle?

the clue
I'm Dara. That's my friend Dylan on the unicycle. His bike is cool, but we decided to use my mountain bike for our test. We figured to go fast you'd need more power. So we tried different gear combinations to see if we could get more speed out of our pedaling. We managed to go faster with each trial, but we didn't get anywhere near 80 miles per hour!
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