Answer:
520 miles
Step-by-step explanation:
 
        
             
        
        
        
You need to make both numbers the same denominator (bottom number). Do this by multiplying. So for the first question you need 15 as the denominator. 3x3=9 5x3=15 first one is 9/15. Then its 1x5=5 and 3x5=15. Then you add 9+5 to get 14. The denominator stays the same. 14/15. This cannot be reduced. If reduced, you would be able to divide both numbers by the same number. 
1. 14/15
2. 5/6
3. 1/2
4. 13/24
5. 13/24 
6. 9/10
7. 5/9
8. 11/35
9. 5/8
10. 1/2
        
             
        
        
        
So first you have to multiply 21 by .1 to figure out ten percent 
you then get 2.1 
you add 21 and 2.1 together and get 23.1
then since you have 3 people you divide by 3 and get 7.7
therefor 7.7 is your answer 
        
             
        
        
        
Answer:
its A
Step-by-step explanation:
 
        
             
        
        
        
This problem cannot be solved but I solved the radical for you