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Fly from one Capital City to another without losing any 'Time'

Fly westwards from one Capital to Another. If you measure change in longitude and distance, you can find the required speed so that when you arrive it's the same "time of the day" as when you left. For which such journeys is the required speed lower?!

Example: Capital B is 30º west of Capital A and is 3,000 km away. 30º corresponds to 2 hours of Earth rotation, so you need to fly at 1,500 km/h
Quiz by scambigol
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Last updated: October 13, 2015
First submittedOctober 13, 2015
Times taken23
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Km/h
From…
…to
776
Helsinki
Reykjavik
790
Tallinn
Reykjavik
793
Ulaanbaatar
Reykjavik
803
Stockholm
Reykjavik
805
Oslo
Reykjavik
817
Ottawa
Ulaanbaatar
819
Tokyo
Reykjavik
835
Helsinki
Oslo
835
Pyongyang
Reykjavik
836
Moscow
Reykjavik
Km/h
From…
…to
838
Astana
Reykjavik
842
Riga
Reykjavik
846
Tallinn
Oslo
847
Seoul
Reykjavik
853
Tallinn
Stockholm
856
Stockholm
Oslo
857
Beijing
Reykjavik
867
Helsinki
Stockholm
884
Washington
Ulaanbaatar
890
Vilnius
Reykjavik
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