Answer:
14 km
Step-by-step explanation:
The area of a trapezoid is
[tex]A = (\frac{b_{1}+b_{2}}{2} )h[/tex]
with [tex]b_{1}[/tex] being base 1, [tex]b_{2}[/tex] being base 2, and h being the height.
Substituting and solving, we get
[tex]152=(\frac{5+b_{2}}{2})(16)\\9.5=(\frac{5+b_{2}}{2})\\19=5+b_{2}\\b_{2}=14 km[/tex]
