There are three questions here:
A. The possible daily output of this process if there is 8 processing time each day?
the time it takes to assemble a chair in seconds = A + B + C + J + K + L + X + Y + Z
which is equal to = 38 + 34 + 35 + 32 + 30 + 34 + 22 + 18 + 20 =263 per chair
Processing hours = 8 hours x 60 minutes x 60 seconds
= 8 x 60 x 60
= 480 x 60 = 28,800 seconds is available in an 8 hr day.
28,800 / 263 =109.5057034220532
Therefore, It is possible to make 109 chairs in an 8 hour day.
B. Given your output rate in above, what is the efficiency of the process?
The time it takes to assemble a chair in seconds = A+ B + C + J + K + L + X + Y + Z.
= 34 + 34 + 34 + 30 + 30 + 30 + 22 + 18 + 20 = 252.6315789473684 per chair
A total of 252 per chair
Processing hours = 8 hours x 60 minutes x 60 seconds
= 8 x 60 x 60
= 480 x 60 = 28,800 seconds is available in an 8 hour day
= 28,000 / 252 = 114.2857142857143114 chairs
= 109/114 x 100 = 95.6140350877193
Therefore, the efficiency of making the chair is 95.61%
C. What is the flow time of the process?
Flow time is the period that it takes a completed chair to flow through the process from the beginning assemblage step to the last step. Take note that ABC and JKL are parallel legs in the process, and as a result both do not include to flow time to the procedure. In addition, Flow time comprises both pass time and run time at each position in the procedure.
. The speed of light in benzene is 
, so we can use the previous relationship to find the refractive index of benzene: