Answer:
1) 45 minutes
2) they meet in 20 minutes
3) (12-6)/(20/60)=18kmh
Step-by-step explanation:

X^2-10x+16= 0
(x-8)(x-2)=0
x = 8 or 2
Do you have answer options for this question?
Answer: A.
.
Step-by-step explanation:
- A difference of squares problem is factored as :

- For this both terms in the form of squares and a minus sign between them.
From all the options only option A has both terms square and they minus sign between them.
Also, 
Here a= 3x and b= 4
Hence, the correct answer is A.
.