Question

Panini, a popular sandwich shop offers 3 types of sandwiches (Grilled Vegetable, Grilled Chicken, and Pastrami). The below info provides demand data for each sandwich per hour:

GV: 10; GC: 15; and Pastrami: 25

There are up to 5 steps in the process of making sandwiches, listed below with activity times. Only 50% of customers want thier sanwich toasted, no matter which sandwich is ordered.

Step	GV	GC	Pastrami
Cut Bread	.75 min	.75 min	.75 min
Grill	1.4 min	1.4 min	-
Slice Meat	-	-	3 min
Toast	2 min	2 min	2 min
Wrap	.5 min	.5 min	.5 min

Suppose Panini employs 1 worker at each step. What is the highest implied utilization of this process? (HINT: find the work load per hour of each activity. Then find the implied utilization of each activity per hour.)

Answer 1

Time utilized in Cut bread step = 10 x 0.75 + 15 x 0.75 + 25 x 0.75

= 0.75 x 50

=37.50 minutes

Time utilized in Grill step = 10 x 1.4 + 15 x 1.4

= 1.4 x 25

= 35 minutes

Time utilized in Slice meat step = 25 x 3 = 75 minutes

Time utilized in Toast step = 10 x 2 + 15 x2 + 25 x 2

= 2 x 50

= 100 minutes

BUt only 50% gets the sandwich toasted so utilization = 50 minutes

Time utilized in Toast step = 10 x 0.5 + 15 x0.5 + 25 x 0.5

=0.5 x 50

= 25 minutes

Thus highest implied utilization of this process is on the slice meat step

and is equal to 75/60 = 1.25 or 125 %