Alex walked 1 mile in 15 minutes Sally walked 3,520 yards in 24 minutes in miles per hour how much faster did sally walk than Alex

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29-05-2017
Mathematics

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Alex walked 1 mile in 15 minutes Sally walked 3,520 yards in 24 minutes in miles per hour how much faster did sally walk than Alex

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jdoe0001 jdoe0001 · Answer 1 · 2017-05-29T02:21:20+02:00

there are 3feet in 1yard, and there are 5280 feet in 1 mile... so let's use those

[tex]\bf \cfrac{3520yd}{24min}\cdot \cfrac{3ft}{1yd}\cdot \cfrac{1mi}{5280ft}\implies \cfrac{3520\cdot 3\cdot 1mi}{24\cdot 1\cdot 5280min}\implies \cfrac{10560mi}{126720min} \\\\\\ \boxed{\cfrac{1mi}{12min}}[/tex]

Alex walked 1 mile in 15minutes, Sally walked the same 1mile in just 12minutes, 3 minutes faster than Alex