To order these from the least to greatest you need to convert them all to one common unit of measurement. In this case I chose feet. 
385 km= 1, 263, 123 ft
2, 521, 728 in= 210, 144 ft
161, 920 yards= 485, 760 ft
And of course 446, 831 feet equals itself. Now all you have to do is put them in the correct order!
Hope this helped :)
        
             
        
        
        
Answer: 150 min
Step-by-step explanation:
2 hours = 120 min, 120 + 30 min = 150 min
 
        
                    
             
        
        
        
Step-by-step explanation:
 They are asking, like units are in the sum