The Sylva Machine Shop was implementing lean throughout their shop floor and needed to determine the number of containers at several of their work centers. In one such work center, the demand was 250 parts per hour, and the containers they used for this part held 35 parts. It normally takes 4 hours for a full container to make a circuit through the work cell and back to its input side, and they desired to carry 16% safety stock in the system.

1. Based on the required safety stock of zero and the number of containers computed in part a, what would be the new required round-trip time, all else being constant?
2. If the demand from the original data was changed to 175 parts per hour, how many containers should the lean system be using, all else being constant?
3. If the required round-trip time from the original data was changed to 3 hours, how many containers should the lean system be using, all else being constant?