It take 23 mins for the drive
He needs to reach the airport by a quarter before 6
a quarter before 6 = 5.45
So he needs to leave 23 mins before 5.45
23 mins before 5.45 = 5.22
Answer:
5.25 + 5.25 = 10.5
8.5 - 3.25 = 5.25
so
5.25 & 8.5 are the answers consequently