1. Mr. K’s Hair Salon Mr. K’s is a very popular hair salon. It offers high-quality hair-styling and physical relaxation

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1. Mr. K’s Hair Salon
Mr. K’s is a very popular hair salon. It offers high-quality
hair-styling and physical relaxation services at a reasonable
price, so it always has unlimited demand. The service process
includes five activities that are conducted in the sequence
described below. (The time required for each activity is shown in
parenthesis):
Activity 1: Welcome a guest and offer homemade
herb tea. (10 minutes)
Activity 2: Wash and condition
hair. (10 minutes)
Activity 3: Neck, shoulder, and back stress
release massage. (10 minutes)
Activity 4: Design the hairstyle and do the
hair. (25 minutes)
Activity 5: Check out the guest. (5
minutes)
Three servers (S1, S2, and S3) offer the services in a
worker-paced line. The assignment of tasks to servers is the
following:
S1 does Activity 1.
S2 does Activities 2 and Activity 3.
S3 does Activities 4 and Activity 5.
a. Draw a PFD for the process.
b. Which server is the bottleneck of the process?
c. What is the utilization of server 2?