Consider a laundry service that has 3 steps to its process. Step 1 is Washing, S

Question

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 capacity at washing in pieces of clothing per hour is (pick the closest integer):

Question 26 options:

a 62 per hour

b 72 per hour

c 92 per hour

d 102 per hour

a 62 per hour

b 72 per hour

c 92 per hour

d 102 per hour

Explanation / Answer

Capacity for each step is as below:

Step 1 = For 1 batch, Total time = Fixed time + 50*variable time = 20 + 50*15/60 = 32.5 minutes

Units per hour = 60*50/32.5 = 92.3

Step 2 = 60 + 40*20/60 = 73.3 minutes

Units per hour = 60*40/73.3 = 32.73

Step 3 = One worker takes 3 minutes. So output = 20 per hour. With two it is 40 per hour

Step 4 = 2 minutes per piece. So, 30 units per hour. But only 50% require it. So, output per hour is equivalent to 30/50% = 60

Ans: Capacity at washing is 92 (C)

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