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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?

 Apr 12, 2021
 #1
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+1

Let  Noah's pace in mph  =  N

Let  the distance  he  rides in 3  hrs =  D

So   3N  = D

 

And

Noah's pace  * 1.6  =   Grady's pace

 

So

 

Grady's  pace * time =  D + 15

 

(N * 1.6  )  *  3    =   D + 15

 

4.8 N  =  D + 15

 

4.8N  =   3N  + 15

 

4.8N - 3N  =   15

 

1.8N    = 15

 

N =  15 / 1.8   =  8.33 mph = Noah's pace

 

 

cool cool cool

 Apr 12, 2021

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