Question

MAKING A BURRITO                                                                                       Names: _________________________

TASKS		Predecessor	Task Time
A	Warm tortilla	-none	20 sec
B	Rice	-A	10 sec
C	Beans	-B	10 sec
D	Meat	-B	10 sec
E	Salsa	-C, D	10 sec
F	Cheese	-E	5 sec
G	Sour Cream	-E	10 sec
H	Lettuce	-E	10 sec
I	Wrap	-F, G, H	15 sec
J	Bag	-I	5 sec
K	Checkout/pay	-J	25 sec

All the information needed to solve the following questions is given.

6. Assign tasks to workstations:

7. Efficiency of your burrito line:

8. Actual output per hour:

9. What if demand were such that 200 / hour were needed?

10. What is the maximum # of burritos that can be produced in an hour with these specific times/tasks?

Answer 1

The network diagram for the activity is given as follows. Each task is assigned to a workstation. Time for each workstation is mentioned in the table in question:

The total time for completion of 1 burrito will be 95 secs. (following Critical path)

(A+B+{C or D}+E+I+J+K)

(20+10+10+10+15+5+25)

EFFICIENCY OF BURRITO LINE:

Sum of all task time= 130 secs

Number of stations= 11

Cycle time= 95 secs

Line efficiency= 12.44%

The critical task is task K which takes 25 sec to complete.

If continuous production is considered, then burritos made in an hour will be= 3600/25= 144 burritos

In order to increase production to 200 burritos per hour, we will need to increase stations for tasks A and K.

Now the new critical task will be task I which takes 15 sec to complete.

Hence the production will be =3600/15 =240 burritos

Maximum burritos that will be produced with the new setting is 240 burritos per hour