Length of journey in air, made by plane?

Solomon Airlines flies from Port Moresby (Papua New Guinea) to Nadi (Fiji) via
Honiara (Solomon Islands) and Port Vila (Vanuatu) on the following schedule:
Depart Stage Arrive
1310 Port Moresby - Honiara 1620
1710 Honiara - Port Vila 1900
1940 Port Vila - Nadi 2210
All times listed are local times in each country. However, Fiji is one hour ahead of
Vanuatu and the Solomon Islands, and these two are one hour ahead of Papua New
Guinea. How long is the plane in the air for the full journey from Port Moresby to Nadi?

Help would be appreciated

Convert all the times to one local time, then add up the hours.

Add the total time required and then substitute each time difference In proper intervals.Then add total number of hours.

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Find the time elapsed between departure from Port Moresby and arrival at Nadi; subtract the total time spent on the ground.