Out-n-In is popular burger joint operated by Timmy, Kimmy and Simmy. When a customer arrives, Kimmy spends 5 minutes taking order from the customer. After this, Kimmy toast bun, and Timmy prepares the patty. These activities are performed in parallel, and take 7 and 6 minutes respectively. Simmy then assembles the burger by putting together the bun and the patty, which takes 10 minutes of his time. Finally, Timmy spends 4 minutes in delivering the order and taking payment. What is the bottleneck and the maximum number of burgers they can make per hour (i.e., what is the capacity of the process)