Answer:
30 miles/1 hour is the unit rate.
Step-by-step explanation:
This is the unit rate because unit rates are a number over 1 unit. 30 miles/1 hour fulfills that, and the others are 2 and 3 hours. 
 
        
             
        
        
        
There is one solution.. for a pair of lines if the lines are perpendicular (these are) they only touch once
        
                    
             
        
        
        
Answer:
7:9
Step-by-step explanation:
Just divide 35 and 45 by 5.