What do you think ? compared to bottoms up method: better, Worse, the same or something Else?
       
      
                
     
    
    
    
    
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I think d because it's the longest side
        
                    
             
        
        
        
Positive if it is an increase. 
Does that help? Idrk what ur asking
        
                    
             
        
        
        
Idk what it is tbh i can’t with math
        
             
        
        
        
        
Cars use 4/9
buses and trains use 1/6
4/9 - 1/6 = 8/18 - 3/18 = 5/18 <== so cars use 5/18 more then buses and trains