B. 10 ft per minute
because the line is steadily increasing at a constant rate yeah, it's 10 feet per minute
 
        
                    
             
        
        
        
The answer would be B. Look at the graph - on top, to the left goes toward -infinity, while to the right it does the opposite. On the bottom, or the y, to the left and right it increases indefinitely. Plug this together, and you have your answer.
I hope this helped, and have a nice day!
        
                    
             
        
        
        
Yes it is true because if 3x +15=2x+60 it is true