111km
the ratio is 1:15 so you do 7.4×15
 
        
                    
             
        
        
        
Answer:
its the first question i think it might be wrong idk
Step-by-step explanation:
because when you find the area you multiply two sides so you have to add 10 and 5 and then multiply it by 18
 
        
             
        
        
        
The correct answer would be t=1/3
        
             
        
        
        
Answer:
300 seconds
Step-by-step explanation:
The first dog run at v₁ = 15 m/sec     the second one run at  v₂ = 12 m/sec
we know that  d = v*t  then  t  =  d/v
Then the first dog will take  300/ 12  =  25 seconds to make a turn 
The second will take   300 / 15   =   20 seconds to make a turn
Then the first dog in 12 turns 12*25 will be at the start point, and so will the second one at the turn 15.
To check  first dog    12 *  25 = 300 
And the second dog 15 * 20 = 300
That means that time required for the two dogs to be at the start point together is
300 seconds, in that time the first dog finished the 12 turns, and the second had ended the 15.
Another procedure to solve this problem is as follows:
between  12  m/sec and  15 m/sec   the minimum common multiple  is 300 ( 300 is the smaller number that accept 12 and 15 as factors         12*15 = 300) Then when time arrives at 300 seconds the two dogs will be again in the starting point
 
        
             
        
        
        
Answer: 6 
Step-by-step explanation: or 9