Just use the formula y=mx+b and you should get your answer 
        
             
        
        
        
If you subtract the times periods form each you will be able to get your answer. So, 9:14-6:30 it will be 2 hours and 44 mins because from 6:30 to 7 it 30 mins, and from 7 to 9 it’s 2 hours. So far, add the two and you get 2h and 30mins and from 9 to 9:14 it’s 14 mins. So, 2h 30 mins plus 14 mins is 2h and 44mins.
        
             
        
        
        
The answer is 19.5 
You add all the numbers to get 273 and divide by the amount of dots which is 14 to get 19.5