ANSWER
[tex]0.237hr[/tex]EXPLANATION
From the given question;
It costs $38 to rent a bike for 9hours.
Hence,
The numbers of hours per dollar would be;
[tex]\begin{gathered} \frac{9}{38} \\ =0.2368hr \end{gathered}[/tex]Therefore the numbers of hours per dollar would be 0.237 hours per dollar