增加段落内单行的字体行距

Question

在段落中，当行间出现数学或特殊字符时，我想增加特定行的行距。在这里我插入了数学分数。请提供解决方案如何解决此问题。

梅威瑟：

\documentclass{book}
\usepackage{arcs,amsmath}

\begin{document}

A passengers flies from one city and then on to another, with the total cost of the flight being $\$ 320$. The order in which the plane flew between the three cities was, A passengers flies $\dfrac{1}{2}$ from one city and then on to another, with the total cost of the flight being $\$ 320$. The order in which the plane flew between the three cities was

\end{document}