The answer would be 400,000; 70,000; 50; 2.
Hope this helps!
        
             
        
        
        
Answer: she would catch up with Tom in 1 hour.
Step-by-step explanation:
Let t represent the time it will take for Mary to catch up with Tom.
Tom leaves his boat from a dock and travels at a rate of 25 miles per hour. 
Distance = speed × time
Distance travelled by Tom in t hours is 
25 × t = 25t
Ten minutes later, Mary leaves the same dock in her speedboat and heads after Tom. Converting 10 minutes to hours, it becomes 10/60 hour 
Time spent by Mary is (t - 10/60) hours. If she travels at a rate of 30 miles per hour, it means that the distance that she would travel in 
(t - 10/60) hours is 
30(t - 10/60) 
= 30t - 5
By the time she catches up with Tom, they would have covered the same distance. It means that 
25t = 30t - 5
30t - 25t = 5
5t = 5
t = 5/5 = 1 hour
 
        
             
        
        
        
Answer:
39
Step-by-step explanation:

 
        
             
        
        
        
Answer:
The ranger will need to clear trail for more than 10 2/3 additional hours.
Step-by-step explanation:
 
        
                    
             
        
        
        
False, this statement is not true, because if you change the parenthesis, it means that you will do that thing first (PEMDAS)
Therefore, the sstatement is false, because the answers will be completely different, 
hope this helps