Answer:
x = 12
Step-by-step explanation:
3(2x/5)
Final result :
6x
——
5
Step by step solution :
Step 1 :
x
Simplify —
5
Equation at the end of step 1 :
x
3 • (2 • —)
5
Step 2 :
Final result :
6x
——
5
The formula of a distance between two points A and B is :

You should this formula by heart.
Then, you just have to apply it ! :D
Here :




Therefore :




In short, the answer would be the first option :

.
Hope this helps !
Photon