Max Durocher makes toy limousines by contract. There are 15 minutes between each one that he makes, and the flow time is 5.75 hours. How much inventory (units of WIP) does he have on average for his steady state process? Go to at least three decimal places for intermediate steps (so 12.1786 would be rounded as 12.179) and one decimal place for your final answer (so 12.1793 would be rounded as 12.2)