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

 Jul 9, 2022
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Let the distance covered by Noah==D

The distance covered by Grady ==D + 15

Let Noah's speed ==S

Grady's speed ==1.6S

 

3S == D.........................(1)

3 * 1.6S ==D + 15..........(2), solve for S, D

 

D==25 miles - distance covered by Noah

S==8 + 1/3 mph - Noah's speed

 Jul 9, 2022

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