Answer:
15 is correct...
Step-by-step explanation:
Since |NB| = |HB|
So the hypotenuse is the same.
3x = x + 10
3x - x = 10
2x = 10
x = 10/2
x = 5
|KN| = x + 10
|KN| = 5 + 10
|KN| = 15
Option A
