45 km at 54 km/hr 
45 / 54 = 5/6 
It took him 5/6 of an hour or 50 minutes I believe
61.4117 km per hr 
 
        
             
        
        
        
Answer:
Step-by-step explanation:
2 plus t
 
        
                    
             
        
        
        
7 1/2 is already simplified to its lowest terms
        
                    
             
        
        
        
17 hundreds
1 ten
8 ones
---
17 hundreds
18 ones
        
             
        
        
        
Square root (8-0)^2 + (8+7)^2
square root 64+15^2
=8+15 
= 23