Answer: B. 50 feet
Explanation:
We can set up a proportion. x will be the length of the second rectangle, I will have width on the bottom (denominator) and length on the top (numerator). All units are in feet:
![(20)/(6) =(x)/(15)](https://img.qammunity.org/2023/formulas/mathematics/high-school/u6z236doelp0c6i78vyv74jx43ltwoxcq4.png)
Now we will cross multiply and solve for x:
300 = 6x
50 = x
x = 50
The length of the second triangle is B. 50 feet