The volume of this triangular prism is 1,690 cubic feet. What is the value of t?

The volume of a triangular prism is given by:
[tex]\begin{gathered} V=\frac{1}{2}bhl \\ where: \\ V=1690ft \\ b=t \\ h=13ft \\ l=20ft \end{gathered}[/tex]Solve for t:
[tex][/tex]