Customers are served in a two step process with two sequential resources. The processing time at the first resource is $12$ minutes and for the second resource it is $5\mathrm{.}7$ minutes. The first resource has $9$ workers and the second resource has $3$ workers.

What is the capacity of this process in terms of customers per hour?

Note: Round your answer to $3$ decimal places.

Capacity in terms of customers per hour