In a manufacturing process, two types of products flow through a three-step process. Each step consists of a single machine. Product A spends 45 seconds at the first step, 35 seconds at the second step, and 50 seconds at the third step. Product B spends 36 seconds at the first step, 40 seconds at the second step, and 25 seconds at the third step. 

The demand rate for Product A is 100 units per hour, and the demand rate for Product B is 120 units per hour. 

Where in the process is the bottleneck and what is its implied utilization?