A worker-machine operation was found to involve 4.8 minutes of machine time per

Question

A worker-machine operation was found to involve 4.8 minutes of machine time per cycle in the course of 40 cycles of stopwatch study. The worker’s time averaged 3.3 minutes per cycle, and the worker was given a rating of 123 percent (machine rating is 100 percent). Midway through the study, the worker took a 10-minute rest break. Assuming an allowance factor of 11 percent of work time which is applied only to the worker element (not the machine element), determine the standard time for this job. (Do not round intermediate calculations. Round your final answer to 2 decimal places.)

Standard time             minutes

Explanation / Answer

Answer: Worker time: 3.3 mins

Machine time: 4.8 mins

Normal man time= man time * performance rating/100= 3.3*1.23 = 4.06 mins

Rest allowance= 10 mins in 40 cycles i.e. 10/40= 0.25 mins per cycle

Allowance factor = 11% of normal man time i.e. 4.06*0.11= 0.44 mins

Standard man time = normal man time + allowances= 4.06+0.44+0.25 = 4.75

Standard machine time = normal machine time + allowances = 4.8 + 0 = 4.8 mins

Therefore, Average Standard Time = (4.75+4.8)/2 = 4.77 mins

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