Work out the arrival time in Dubai time by subtracting the flight time from the arrival time in Sydney time: 22:10 - 13 hours 40 minutes = 08:30. Then find the time difference between the Dubai arrival time and the departure time: 08:30 - 08:55 = -00:25; then the time difference between 08:55 and 22:10, which is 13 hours and 15 minutes. This does not work. A better strategy, with a more logical and correct answer, is: First, determine the flight time between Dubai and Sydney, which takes 13 hours 40 minutes. Then add the flight time to the departure time in Dubai, and then subtract the arrival time by 22:10, the correct answer is 22:10- (08:55 + 13 hours 40 mins), where 08:55 + 13 hours 40 mins = 22:35, and 22:10 - 22:35 =-25 mins. Not logical, as the image gives the correct answer of 9 hours and 35 mins