In Example 29.4 (solved in lecture class), the welder works alone, performing not only the welding but also loading and unloading the parts. Suppose a fitter is used in the work cycle to load the starting parts and unload the weldment, and a two-position fixture is installed so that the welder and fitter can work simultaneously. The fixture is designed to index (rotate) between the two positions at the end of each work cycle; indexing time = 0.15 min. The fitter performs the work handling elements, and the welder performs all elements related to welding and changing electrodes. Determine the (a) work cycle time and (b) the arc-on time as a fraction of the work cycle time. If the welder and fitter take 30 min of rest breaks during the 8-hr work shift, (c) how many weldments are produced during the shift, and (d) what is the arc-on time as a fraction of the 8-hr shift?