Answer
$\frac{1\text{ mile}}{160934\text{ cm}}$ and $\frac{3600\text{ seconds}}{1\text{ hour}}$
Work Step by Step
In part 2, the units needed are miles and hours.
(1) $1$ mile = $160934$ centimeters,
(2) $1$ hour = $3600$ seconds.
Using unit analysis, the expressions needed for conversion are
$$
\frac{1\text{ mile}}{160934\text{ cm}}
\text{ and }
\frac{3600\text{ seconds}}{1\text{ hour}}
.$$
