Respuesta :

2 buses 
Bus 1: 11 miles slower;? miles faster
Bus2:? miles fast
 
636/4 = ?/2 
? = 318 
636/4 = 318/2
  
So plug it all in: 

 Bus1: 318/2 - 11
Bus2: 318/2

Rate of slower bus: 148 m/h
Rate of faster bus: 159m/h
 
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