Rock View Restaurant is a new fast-food restaurant chain. The Operations Manager has divided its normal drive-through service process into the following tasks: Task Description Task time in seconds Predecessors A Take Order 25 none B Received Payment 20 A C Gather Drinks 35 A D Gather Food 32 A E Put food etc. in bag 25 C,D F Give food to customer 10 B,E Currently, Rock View Restaurant has a single window with one person who takes the order, gather the food, collects the money and gives the food to the customer. This takes an average of 147 seconds per customer so only 25.5 cars can be served. Rock View Restaurant wants to increase its drive-through capacity to 60 cars per hour by forming a multi-window line. i. Draw the precedence diagram to represent the process at Rock View Restaurant. ii. Calculate the cycle time in seconds. iii. Calculate the minimum number of windows that Rock View Restaurant will need to serve 60 cars per hour.

Rock View Restaurant is a new fast-food restaurant chain. The Operations Manager has divided its normal drive-through service process into the following tasks: Task Description Task time in seconds Predecessors A Take Order 25 none B Received Payment 20 A C Gather Drinks 35 A D Gather Food 32 A E Put food etc. in bag 25 C,D F Give food to customer 10 B,E Currently, Rock View Restaurant has a single window with one person who takes the order, gather the food, collects the money and gives the food to the customer. This takes an average of 147 seconds per customer so only 25.5 cars can be served. Rock View Restaurant wants to increase its drive-through capacity to 60 cars per hour by forming a multi-window line. i. Draw the precedence diagram to represent the process at Rock View Restaurant. ii. Calculate the cycle time in seconds. iii. Calculate the minimum number of windows that Rock View Restaurant will need to serve 60 cars per hour.

Practical Management Science

6th Edition

ISBN:9781337406659

Author:WINSTON, Wayne L.

Publisher:WINSTON, Wayne L.

Chapter12: Queueing Models

Section: Chapter Questions

Problem 59P

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Task	Description	Task time in seconds	Predecessors
A	Take Order	25	none
B	Received Payment	20	A
C	Gather Drinks	35	A
D	Gather Food	32	A
E	Put food etc. in bag	25	C,D
F	Give food to customer	10	B,E