\textbf{158-} The velocity--time graph of a particle moving along the \textbf{x}-axis is shown below. If at $t = 0$, the position of the particle is $x = 0$, after how many seconds does the particle pass through this point again?
\textit{[Figure: velocity-time graph showing a line starting from origin, passing through point (5,0) area, with a point marked at t=9 on the time axis]}
\begin{itemize}
\item[(1)] 15
\item[(2)] 16
\item[(3)] 18
\item[(4)] 20
\end{itemize}