Let's compare!
Taylor ran 57 + 48 mins total. Sum would be 105 mins.
Mark ran 62 + 53 mins total. Sum would be 115 mins.
Clearly, the two sums are different when we compare them using subtraction.
115 - 105 = 10. Mark ran 10 mins longer than Taylor.
 
        
                    
             
        
        
        
Answer: 16 1/2
Step-by-step explanation:
It's easiest to multiply improper fractions and then to convert them back into mixed numbers, so 4 1/2 would become 9/2 and 3 2/3 would become 11/3.  = 99/6. Now just simplify to 33/2 and then convert back into a mixed number.  16 1/2
= 99/6. Now just simplify to 33/2 and then convert back into a mixed number.  16 1/2
 
        
             
        
        
        

Hope you could get an idea from here.
Doubt clarification - use comment section.
 
        
                    
             
        
        
        
You simply put 40 over a hundred and 55 over n (which is the number were trying to find)  so you do cross multiplication. 55 times a hundred and after you get the answer. You divide it by 40 and should get 137.5.