Question 7
An airplane makes consecutive flights between Hà Nội and Hồ Chí Minh City, alternating directions. Each flight takes 2 hours 15 minutes, and the break between consecutive flights is 45 minutes. If the first takeoff from Hà Nội is at 5:30 a.m., how many times has the airplane taken off by 11 p.m. that day?
