Answer:
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Step-by-step explanation:
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 The distance between the trains is changing at the rate of (70 -60) = 10 mph. They will be in the same place (45 mi)/(10 mi/h) = 4.5 hours after they leave their respective cities. They will be 10 miles apart both 1 hour before that time and one hour after that time.
The trains will be 10 miles apart 3.5 hours after leaving.
They will be 10 miles apart the second time 5.5 hours after leaving.
 
        
                    
             
        
        
        
 Answer: 18 pounds
Step-by-step explanation:
450 pounds = 25 buckets
1 bucket = 1 / 25 x 450
= 18 pounds
 
        
                    
             
        
        
        
You add 70,50, and 90 together then you do seperately 30, and80 (add) lastly take that amount then divide that by your first sum