Question 43888
Divide 6 hours by 30 mins (0.5 hrs) to find the maximum number:  {{{6/0.5 = 12}}}
Divide 6 hours by 45 mins (0.75 hrs) to find the minimum number: {{{6/0.75 = 8}}}
The crew can prepare between 8 and 12 aircraft in a 6-hour time period.