Please explain clearly.

Practice Problem 2. GGs caf has two person making special coffees. Both have roughly the same experience and skill, but one is just a little bit slower than the other is. The process flow below shows that all customers go through steps S1 and S2, and then their coffee is prepared by either of the two servers at step S3. The process ends for all customers at step S4. The numbers in parentheses indicate the minutes it takes that activity to process a customer. Find out the following: The bottleneck step: S4 Process cycle time: 4 minutes Process capacity: 15 customers/ hour Throughput time: 14.5 minutes . . S3-a (5 min) S1 (2 min) S2 (3 min) S4 (4 min) S3-b (6 min)