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Grady rides his bike 60% faster than his little brother Noah. If Grady rides 15 miles further than Noah in two hours, how fast in miles per hour does Noah ride?

 Apr 4, 2021
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Noah rides at $n$ mph. Grady rides at $1.6n$ mph. Then $3.2n-2n=15\implies \boxed{n=12.5}$

 Apr 4, 2021

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