Consider the following layout of a car washing process:

Scrubbing $(4$ minutes$)$

Rinsing $(8$ minutes$)$

Drying $(4$ minutes$)$

What is the throughput rate of the process?

$0\mathrm{.}125$ cars per hour

$7\mathrm{.}5$ cars per hour

$8$ cars per minute

$8$ minutes per car

$16$ minutes per car