What 2 poles of height 7m and 12m

Answer: The correct answer would be 13 m

notes on the figure

1. the left pole equals to 12 m (5+7)

2. the right pols equal to 7m

3. the lower distance between them is given that is 12m

4. a triangle is formed above the rectangle formed by them

the triangle ABC is a right-angled triangle

by Pythagoras

(ac) ^2 = (ab) ^2 + (bc) ^2

ac^2=5^2+12^2

ac^2=25+144

ac^2=169

ac=root 169

ac=13m

their distance is 13m