You can solve all of these by using the distance formula. I have shared it below. 
        
             
        
        
        
Let, snake catches the mouse in t hours. Till then mouse is travelling from
( t + 1.5 ) hours.
Distance, travelled by mouse in t hours is,  .
 .
To catch the mouse snake had to travel the same distance d in  t hours.
So,
 
Therefore, snake will catch mouse in 1.5 hours.
 
        
             
        
        
        
First, let x be the number of hours it will take for Hector to finish the same job alone. This means that every hour, Hector can do 1/x of the job. The amount of work done by Shawn and Hector in 6 hours should be equal to 1 complete work. This can be expressed as,
                      (1/9 + 1/x)(6) = 1
The value of x is 18. Thus, Hector can to 1/18 of the job in one hour. 
        
                    
             
        
        
        
Answer:
6.7 * (10^7) = 67 000 000
 
        
                    
             
        
        
        
Answer:
I dont get what you are asking can you put more detail for what you want the answer to be please
Step-by-step explanation: