Answer:
308 minutes
Explanation:
The average waiting time = [tex]\frac{42*5^2+4(540)^2}{2*(480-(42*5)-540*4))}[/tex]
= [tex]\frac{42*25+1166400}{2*(480-(210)-2160))}[/tex]
= [tex]\frac{1167450}{-3780}[/tex]
= - 308.85 minutes
Thus; alex average waiting time, in minutes, 308 minutes if he still wants to continues to be the only worker.