1. Consider a three-stage process with the stage named as Process A, Process B and Process C. Input comes into Process A. Output form A goes into Process B. Output from B goes into Process C. Output of C is the final output. Suppose that it takes 2 minutes per unit in Process A, 3 minutes per unit in Process B, and 1 minute per unit in Process C. Suppose further that Process A receives input at the rate of 30 per hour. Where would you place a buffer?

In front of both Process B and Process C

In front of Process B

In front of Process A

In front of Process C

2. Consider a laundry service that has 3 steps to its process. Step 1 is Washing, Step 2 is Drying, Step 3 is Ironing & Step 4 is Packaging. Step 1 Washing is a batch operation, with a batch size of 50 pieces of clothing, variable time of 15 seconds per piece and a fixed time of 20 minutes. There is one washing machine. Step 2 Drying is also a batch operation, with a batch size of 40 pieces of clothing, variable time of 20 seconds per piece, and a fixed time of 60 minutes. There is one drying machine. Step 3 is a manual operation where a team of 2 workers iron the clothes; each worker takes on average 3 minutes to iron a piece of clothing. Step 4 is again a manual operation, where only one worker packages the clothes in an average of 2 minutes per piece; only 50% of the clothes need packaging. Answer the next several questions based on the data above.

The lead time to process a batch for drying is (pick the closest integer):

a 63 mins

b 73 mins

c 83 mins

d 93 mins