The minimum cycle time is

$90$

seconds. $($Enter your response as a whole$$ number.$)$

Part $4$

The longest cycle time is

$135$

seconds. $($Enter your response as a whole$$ number.$)$

Part $5$

b$.$ Suppose$$ Billy's Hamburger Barn redesigns the process so there are now two attendants. The first attendant takes the order. Once this step is$$ finished, the first attendant then takes the$$ money, and the second one gathers up and bags the food. Two of the process steps can now run in parallel$($gathering the food and taking the$$ money$).$

New minimum cycle time is

$55$

seconds. $($Enter your response as a whole$$ number.$)$

Part $6$

New longest cycle time is

enter your response here

seconds.