Answer:
3 and 17/24 cups of flour
Step-by-step explanation:
You need to make the denominator the same so find what number the 8 and 3 can both be turned into to make the same number. They can both be made into a 24. 8x3=24 so you multiply the 3 by 3 making 9. Do the same to the 1/3, multiplying both by 8 making 8/24. 
2 9/24 and 1 8/24 which can be made into 3 17/24
 
        
                    
             
        
        
        
Since the y coordinate is the same for both points we only need to know the change in the x coordinates to find the distance between these two points.
5--12=17
So these two points are 17 units apart.