Each R requires 2 of component S and 1 of part T. The lead time for assembly of R is 3 days. The lead time for the manufacture of S is 5 days. The lead time for the manufacture of T is 10 days. The cumulative lead time for R is ________ days.
A) 6
B) 9
C) 13
D) 17
E) 22

Question

Quizplus · Accepted Answer

To manufacture one R, we need 2S and 1T. 
The lead time for making S is 5 days, and we need 2S for one R, so the lead time for producing enough S for one R is 2*5 = 10 days. 
The lead time for making T is 10 days, so the lead time for producing enough T for one R is 10 days. 
Thus, the total lead time for producing one R is 10+10+3 = 23 days. 
Therefore, the cumulative lead time for R is 13 days.

Each R Requires 2 of Component S and 1 of Part