How do calculate my flight time

How do calculate my flight time?
How long will the flight be? How to Solve - (Arrival - Departure = Flight Time) 1.) Departure- Houston,1:30 pm Arrival- Honolulu, 7:08 am Flight Time ? 2.) Departure- New York, 8:00 pm Arrival Los Angeles, 9:53 pm Flight Time ? 3.) Departure- Washington DC, 7:20 am Arrival Boston, 8:24 am Flight time ? When will i arrive? ( Departure + Flight time = Arrival) Departure- Memphis, 7:20 am Arrival- New York ? Flying time 3 hr. 55 min Departure- Washington DC, 11:05 am Arrival- Portland, ? Flight Time - 8 hr. 35 min
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1. Hawaii time is 4 hours behind Houston. Therefore it would be 9:30 am Hawaii time when you fly out. Therefore if you arrive at 7:08 am, you must have had to overnight somewhere and the trip lasted 21 hours and 38 minutes. 2. LA is 3 hours behind NY so you flew out at 5 pm LA time and if you arrive at 9:53 pm, the flight took 4 hours and 53 minutes. 3. DC and Boston are in the same time zone so the flight took 1 hour and 4 minutes. Memphis is 1 hour behnd New York so if you depart 7:20 CST, then that is 8:20 EST and the arrival time would be 12:15 pm. DC is 3 hours ahead of Portland so if you fly out at 11:05 am EST, that is 8:05 am, PST and an 8 hour 35 minute flight gets you into Portland at 4:40 pm.