A Lean System Uses 12 Containers, Each of Which Can

Multiple Choice

A lean system uses 12 containers, each of which can hold 12 parts. The lead time required to round-trip one container through the system is normally 3 hours. The usual safety stock is 20%.
-If the demand rate is changed to 50 parts per hour, what would be the new required round-trip time, all else being constant?

A) 2.4 hours
B) 3 hours
C) 3.75 hours
D) 5 hours
E) Need additional information to compute the value