The typical speed of Boeing 777-300ER on the way from Warsaw to New York is 916 km/h (569 mph). On its way back it reaches 1140 km/h (708 mph). How is it possible?

it flies at higher altitude

jet stream helps

air convection helps

plane is lighter on way back

The location of the jet stream is extremely important for aviation. Commercial use of the jet stream began on 18 November 1952, when Pan Am flew from Tokyo to Honolulu at an altitude of 7,600 metres, cutting the trip time by over one-third.

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Adrian Pingstone wikipedia → Jet stream

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Answers by country

Thailand

92%

Austria

90%

Italy

88%

Norway

72%

16%

Spain

70%

17%

11%

South Africa

11%

66%

16%

the United States

11%

65%

11%

568

the United Kingdom

10%

65%

14%

323

Australia

12%

62%

13%

Canada

60%

17%

Germany

10%

58%

18%

160

Unknown

58%

29%

the Netherlands

57%

27%

France

10%

55%

25%

10%

Poland

12%

52%

22%

18381

Republic of Ireland

18%

50%

29%

Greece

11%

47%

29%

the Philippines

36%

16%

12%

India

20%

35%

28%

167

Nigeria

50%

12%

18%

What is the lowest recorded air temperature ever recorded on Earth (Vostok Station - Antarctica)?

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In moderate and cold climates, a tree gains one ring every year, which allows us to estimate its age. Where else we can estimate age in similar fashion?

on the beach, layers of sand and grit

at the bottom of the lake, sedimentation

in the craters, pyroclastic rocks

in the glaciers, layers of clay and sand